Analysis Overview
SHA256
a209252f476c58e9facfb122bec872db6f971326fddada2a3d62153aff6b1206
Threat Level: Known bad
The file e5c83994fb7a6ab58291ac93755d93a6.zip was found to be: Known bad.
Malicious Activity Summary
Egregor Ransomware
Modifies extensions of user files
Drops startup file
Reads user/profile data of web browsers
Drops file in Windows directory
Drops file in Program Files directory
Suspicious behavior: RenamesItself
Suspicious use of AdjustPrivilegeToken
Suspicious behavior: EnumeratesProcesses
Suspicious use of WriteProcessMemory
MITRE ATT&CK
Enterprise Matrix V6
Analysis: static1
Detonation Overview
Reported
2020-12-08 16:23
Signatures
Analysis: behavioral1
Detonation Overview
Submitted
2020-12-08 16:23
Reported
2020-12-08 16:33
Platform
win7v20201028
Max time kernel
241s
Max time network
240s
Command Line
Signatures
Egregor Ransomware
Modifies extensions of user files
| Description | Indicator | Process | Target |
| File renamed | C:\Users\Admin\Pictures\SetConvertFrom.raw => C:\Users\Admin\Pictures\SetConvertFrom.raw.HhPv | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File renamed | C:\Users\Admin\Pictures\UninstallReceive.raw => C:\Users\Admin\Pictures\UninstallReceive.raw.HhPv | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File renamed | C:\Users\Admin\Pictures\BackupInvoke.tiff => C:\Users\Admin\Pictures\BackupInvoke.tiff.lKxB | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File renamed | C:\Users\Admin\Pictures\CompressStop.tif => C:\Users\Admin\Pictures\CompressStop.tif.lKxB | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File renamed | C:\Users\Admin\Pictures\PushMount.crw => C:\Users\Admin\Pictures\PushMount.crw.rxeKAR | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File opened for modification | C:\Users\Admin\Pictures\RemoveStop.tiff | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File renamed | C:\Users\Admin\Pictures\RemoveStop.tiff => C:\Users\Admin\Pictures\RemoveStop.tiff.rxeKAR | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File renamed | C:\Users\Admin\Pictures\WaitFind.tif => C:\Users\Admin\Pictures\WaitFind.tif.HhPv | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File renamed | C:\Users\Admin\Pictures\AddUnlock.tif => C:\Users\Admin\Pictures\AddUnlock.tif.lKxB | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File opened for modification | C:\Users\Admin\Pictures\BackupInvoke.tiff | C:\Windows\SysWOW64\rundll32.exe | N/A |
Drops startup file
| Description | Indicator | Process | Target |
| File created | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\e6189640.lnk | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File created | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\RECOVER-FILES.txt | C:\Windows\SysWOW64\rundll32.exe | N/A |
Reads user/profile data of web browsers
Drops file in Program Files directory
| Description | Indicator | Process | Target |
| File created | C:\Program Files (x86)\Microsoft SQL Server Compact Edition\v3.5\RECOVER-FILES.txt | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File created | C:\Program Files (x86)\Microsoft SQL Server Compact Edition\v3.5\Desktop\e6189640.lnk | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File created | C:\Program Files (x86)\Microsoft SQL Server Compact Edition\v3.5\Desktop\RECOVER-FILES.txt | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File created | C:\Program Files\RECOVER-FILES.txt | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File created | C:\Program Files (x86)\RECOVER-FILES.txt | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File created | C:\Program Files (x86)\Microsoft SQL Server Compact Edition\e6189640.lnk | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File created | C:\Program Files (x86)\Microsoft SQL Server Compact Edition\RECOVER-FILES.txt | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File created | C:\Program Files (x86)\Microsoft SQL Server Compact Edition\v3.5\e6189640.lnk | C:\Windows\SysWOW64\rundll32.exe | N/A |
Drops file in Windows directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\RECOVER-FILES.txt | C:\Windows\SysWOW64\rundll32.exe | N/A |
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: RenamesItself
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\rundll32.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeBackupPrivilege | N/A | C:\Windows\system32\vssvc.exe | N/A |
| Token: SeRestorePrivilege | N/A | C:\Windows\system32\vssvc.exe | N/A |
| Token: SeAuditPrivilege | N/A | C:\Windows\system32\vssvc.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\SysWOW64\rundll32.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Windows\system32\cmd.exe
cmd /c "C:\Users\Admin\AppData\Local\Temp\exec.bat"
C:\Windows\SysWOW64\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\b.dll,DllRegisterServer --pass2police --full
C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\b.dll,DllRegisterServer --pass2police --full
C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
Network
Files
memory/1228-3-0x0000000000000000-mapping.dmp
memory/1100-2-0x0000000000000000-mapping.dmp
memory/1228-4-0x0000000000240000-0x000000000027F000-memory.dmp
memory/1228-6-0x0000000000370000-0x000000000039A000-memory.dmp