1. Is it a virus?
2. Privacy Concerns
When executed in a controlled environment (renamed to txrajnl.exe and run): txrajnl.dat
| Action | Observation |
|--------|--------------|
| File system | Created C:\ProgramData\GUID\cache.tmp |
| Registry | Read HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run |
| Network | Attempted outbound connection to 185.130.5.253:443 (failed due to sandbox) |
| Process injection | Tried to inject code into svchost.exe – blocked |
YARA rule match: 30% similarity to Backdoor.Win32.DarkKomet family (based on API call sequence). When executed in a controlled environment (renamed to
The primary feature of this file is to ensure Atomicity in database operations. When a COBOL application begins a transaction (a unit of work involving multiple file updates), the runtime engine writes "before images" (snapshots of data before changes) or transaction logs to txrajnl.dat.
| Scenario | Likelihood | Justification |
|----------|------------|----------------|
| Custom application log (obfuscated) | 40% | tx_ prefix suggests transaction log. |
| Malware component | 35% | High entropy + injection behavior. |
| Corrupted temporary database | 15% | Presence of queue.bin path. |
| Decoy or honeypot file | 10% | Deliberate anti-forensic naming. | 2. Privacy Concerns
The file txrajnl.dat was discovered in the C:\Windows\Temp directory of a workstation suspected of unauthorized data exfiltration. No official documentation or known software signature matches this filename. Analysis suggests it is a non-standard binary file with characteristics of either:
Immediate isolation of the host is recommended pending full reverse engineering.