Troubleshooting Emsisoft Decrypter for GlobeImposter ErrorsGlobeImposter (also known as Globe Imposter) is a family of ransomware that has encrypted files and appended various extensions to victims’ filenames, often demanding payment for the decryption key. Emsisoft’s decrypter tools aim to help victims recover files without paying the ransom when possible. However, running a decrypter isn’t always straightforward — errors can occur for many reasons: corrupted files, incomplete key information, incompatible file variants, or mistakes during the decryption process itself. This article walks through common errors encountered with the Emsisoft Decrypter for GlobeImposter and provides step-by-step troubleshooting strategies, preventive tips, and best practices to maximize your chances of successful recovery.
Overview: How Emsisoft Decrypter for GlobeImposter works
The decrypter attempts to identify the specific GlobeImposter variant and use known vulnerabilities or recovered keys to decrypt affected files. It typically works by:
- Scanning encrypted files and matching their structure/extension to a known variant.
- Locating required key files or retrieving key data from the ransom note or memory dumps (if supported).
- Attempting test decryptions on sample files before bulk processing.
- Writing restored files to a destination folder while optionally preserving originals.
Understanding this flow helps diagnose where an error occurs: detection/identification, key acquisition, decryption attempt, or write/permission issues.
Common Errors and How to Troubleshoot Them
1) “No key found” or “Key not available for this ID”
Symptoms:
- The decrypter reports it cannot find a decryption key for the identified key ID or partner ID.
Causes:
- The specific GlobeImposter variant uses a unique or unrevealed key not in current decrypter databases.
- The ransomware used per-victim keys stored on the attacker’s server (not recoverable).
- The decrypter misidentified the variant due to renamed extensions or modified file headers.
Troubleshooting steps:
- Verify the exact extension(s) appended to files and any ransom note text — save samples and screenshots.
- Make note of any key IDs displayed in the ransom note (often included in the filename or message).
- Ensure you’re using the latest version of the Emsisoft Decrypter — developers update signatures and key databases frequently.
- Submit sample encrypted files and the ransom note to Emsisoft’s support/ID Ransomware (or their upload portal) so researchers can identify the variant or add support.
- If per-victim online keys were used, recovery without the attacker’s cooperation may be impossible; focus on backups and forensic containment.
When to accept defeat:
- If researchers confirm the variant uses unique online keys and no master key is available, do not waste more time on decrypters; prioritize restoring from backups and rebuilding systems.
2) “Decryption failed” or decrypted files remain corrupted/garbled
Symptoms:
- The tool runs and claims success for some files, but many restored files are corrupted or won’t open.
Causes:
- Partial file corruption from disk errors, interrupted encryption, or overwriting during the infection.
- The decrypter used an incorrect algorithm or key due to misidentification of variant.
- Files were partially encrypted multiple times by different ransomware strains.
Troubleshooting steps:
- Verify file integrity: if the original file’s header is damaged, decryption can produce unusable output. Use a hex viewer to compare encrypted vs decrypted headers where possible.
- Attempt decryption on a copy of files, not originals, to preserve state for additional analysis.
- Try multiple sample files of different types (images, documents) to check whether corruption is universal or type-specific.
- Re-scan with the latest decrypter version and re-run identification steps; provide Emsisoft with examples.
- Consider using file-repair tools for specific formats (e.g., Office file repair, image repair) after decryption if headers are damaged but content intact.
Notes:
- Some ransomware only encrypts parts of the file or uses streaming methods; a decrypter must replicate that exact process to rebuild files correctly.
3) “Access denied” / Permission or write errors
Symptoms:
- The decrypter cannot write recovered files to the destination, or it crashes when attempting to overwrite.
Causes:
- Insufficient file system permissions (running without admin privileges).
- Files are locked by other processes (antivirus, backup agents, or system services).
- Destination drive is read-only, full, or has filesystem errors.
Troubleshooting steps:
- Run the decrypter as an Administrator (Windows) or with elevated privileges if required.
- Disable or pause third-party antivirus and real-time protection temporarily — some security products will block decrypters’ actions.
- Ensure destination drive has enough free space and is healthy: run chkdsk /f or equivalent.
- Copy encrypted files to another drive or folder and run the decrypter on that copy to avoid permission conflicts.
- If using network shares, copy files locally; network permissions or latency can interrupt the process.
Caution:
- Only disable security tools temporarily and re-enable them immediately after the decryption attempt. Prefer doing this in an isolated environment or offline system.
4) Crashes, freezes, or the decrypter becomes unresponsive
Symptoms:
- The tool freezes during scanning or decryption; it may consume high CPU/memory or exit unexpectedly.
Causes:
- Large volumes of files cause memory pressure.
- Bad input files (very large or malformed) provoke exceptions.
- Incompatibility with the OS or missing runtime frameworks.
Troubleshooting steps:
- Ensure system meets minimum requirements and has adequate RAM/free disk space.
- Update Windows and the .NET runtime if required (Emsisoft tools often need recent runtimes).
- Process files in smaller batches — move subsets to a working folder and run decryption on one folder at a time.
- Check Windows Event Viewer or crash logs for exception details and share them with Emsisoft support if needed.
- Try running the decrypter on another clean machine with copies of the encrypted files.
5) “Variant not supported” or unidentified variant
Symptoms:
- The decrypter reports an unknown variant or refuses to run because files don’t match known signatures.
Causes:
- New GlobeImposter strain not yet analyzed.
- Attackers modified file headers or combined multiple ransomware families.
- Files were renamed or partially decrypted earlier by another tool.
Troubleshooting steps:
- Collect representative encrypted files and the ransom note. Include file extensions, sample encrypted filenames, and any attacker contact addresses.
- Upload samples to Emsisoft or ID Ransomware to get identification; this helps researchers prioritize development.
- Keep systems offline and preserve samples — don’t run unknown tools that could alter metadata before analysis.
- Monitor Emsisoft’s release notes and ransomware blogs for support updates — newly added variants are often announced.
- If necessary, engage an experienced incident responder who can analyze the ciphertext patterns and possibly extract keys from memory or backups.
6) Wrong files selected / accidental overwrite of originals
Symptoms:
- Originals were overwritten by decrypted versions or encrypted copies were lost.
Prevention and recovery:
- Always work from copies of encrypted files — never run a decrypter directly on the only copies.
- Configure the decrypter’s output folder explicitly to a separate location and confirm before proceeding.
- If originals were overwritten, check shadow copies, backups, or file-history systems (if available) for recovery.
- Use forensic disk-imaging tools to capture a full disk image before further operations if the data is critical — this preserves a recoverable state.
Practical checklist before running the decrypter
- Back up all encrypted files: copy them to an external drive or image the disk.
- Save a copy of the ransom note and record attacker details (email, ID, extension).
- Disconnect infected machines from networks to prevent further spread.
- Update the Emsisoft Decrypter to the latest version.
- Run antivirus scans to remove residual ransomware binaries; isolate samples for research.
- Prefer running in a clean, offline environment or on a forensic copy.
- If unsure, contact Emsisoft support or an incident response firm with sample files.
When to involve professionals
- Large-scale infections affecting servers or business-critical systems.
- Presence of multiple ransomware families or evidence of data exfiltration.
- When decrypter errors persist despite following troubleshooting steps.
- Legal/compliance requirements (e.g., regulated data breach reporting).
Professional responders can capture volatile memory to recover keys, analyze unique variants, and coordinate recovery and legal requirements.
Preventive measures to reduce future risk
- Maintain tested, versioned backups with offline or immutable copies.
- Apply principle of least privilege and patch management to reduce attack surface.
- Use endpoint protection with anti-ransomware features and enable behavior-based detection.
- Implement network segmentation, disable SMBv1, and restrict remote desktop exposure.
- Conduct regular drills for ransomware response and have an incident response plan.
Submitting samples to Emsisoft (what to include)
- Several encrypted sample files (not more than requested by their upload form).
- The ransom note and any attacker IDs or contact addresses.
- Information about file extensions, timestamps, and how the infection was discovered.
- Any crash logs or errors produced by the decrypter.
Providing detailed, well-labeled samples speeds up analysis and increases the chance of support success.
Final notes
Ransomware recovery is often time-sensitive and emotionally charged. Emsisoft’s decrypters are a powerful option when a supported key exists, but they aren’t a guaranteed cure-all. Preserve evidence, work from copies, keep software up to date, and consult researchers or incident responders when uncertainties remain. Recovery is a mix of correct tooling, patient analysis, and sometimes accepting that backups and system rebuilds are the most reliable route.
If you want, provide a sample encrypted filename, file extension, and the ransom note text and I can suggest the next concrete steps.