Analysis
- max time kernel
138s - max time network
172s - platform
windows10-2004_x64 - resource
win10v2004-20221111-en - resource tags
- submitted
21/11/2022, 15:23
General
- Target file.exe
- Size 1011KB
- Sample221121-ssf5nafc75
- SHA256 1e178cb5d1ceea8f6a38b6ac8c8cf7f930419e89d9d2c161548643dcff600c96
Malware Config
Signatures
- Blocklisted process makes network request 4 IoCs
- Loads dropped DLL 1 IoCs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Suspicious use of SetThreadContext 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Program crash 1 IoCs
- Checks processor information in registry 2 TTPs 22 IoCs
Processor information is often read in order to detect sandboxing environments.
- Modifies registry class 5 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of FindShellTrayWindow 1 IoCs
- Suspicious use of WriteProcessMemory 6 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\rundll32.exe"C:\Windows\system32\rundll32.exe" "C:\Users\Admin\AppData\Local\Temp\Wuwedteata.tmp",Tiuqiiueaur2⤵
- Blocklisted process makes network request
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Checks processor information in registry
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\rundll32.exe"C:\Windows\system32\rundll32.exe" "C:\Windows\system32\shell32.dll",#61 224853⤵
- Modifies registry class
- Suspicious use of FindShellTrayWindow
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 1332 -s 5322⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 1332 -ip 13321⤵
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C:\Windows\System32\rundll32.exeC:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding1⤵
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C:\Windows\SysWOW64\svchost.exeC:\Windows\SysWOW64\svchost.exe -k LocalService1⤵
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C:\Windows\SysWOW64\rundll32.exe"C:\Windows\system32\rundll32.exe" "c:\program files (x86)\windows defender\de-de\distribute_form.dll",g0c8QzdTSGM=2⤵
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
distribute_form.dll
distribute_form.dll
Microsoft.LockApp_10.0.19041.1023_neutral__cw5n1h2txyewy.xml
MicrosoftOutlook2013CAWin64.xml
Riirsyiyayu.tmp
edb.jcp
stream.x64.en-us.db
user-40.png
Wuwedteata.tmp
Wuwedteata.tmp
distribute_form.dll
memory/1332-136-0x00000000023F0000-0x0000000002511000-memory.dmp
memory/1332-137-0x0000000000400000-0x0000000000662000-memory.dmp
memory/1332-135-0x0000000002305000-0x00000000023E3000-memory.dmp
memory/2572-165-0x0000000004920000-0x000000000549A000-memory.dmp
memory/2572-166-0x0000000004920000-0x000000000549A000-memory.dmp
memory/2572-167-0x0000000004920000-0x000000000549A000-memory.dmp
memory/3864-141-0x00000000040E0000-0x0000000004220000-memory.dmp
memory/3864-144-0x00000000040E0000-0x0000000004220000-memory.dmp
memory/3864-138-0x0000000005F90000-0x0000000006B0A000-memory.dmp
memory/3864-139-0x00000000040E0000-0x0000000004220000-memory.dmp
memory/3864-140-0x00000000040E0000-0x0000000004220000-memory.dmp
memory/3864-151-0x0000000005F90000-0x0000000006B0A000-memory.dmp
memory/3864-142-0x00000000040E0000-0x0000000004220000-memory.dmp
memory/3864-146-0x0000000004159000-0x000000000415B000-memory.dmp
memory/3864-143-0x00000000040E0000-0x0000000004220000-memory.dmp
memory/4648-148-0x000001B0A38C0000-0x000001B0A3B68000-memory.dmp
memory/4648-147-0x0000000000610000-0x00000000008A7000-memory.dmp
memory/4648-149-0x000001B0A5310000-0x000001B0A5450000-memory.dmp
memory/4648-150-0x000001B0A5310000-0x000001B0A5450000-memory.dmp
memory/4648-152-0x000001B0A38C0000-0x000001B0A3B68000-memory.dmp
memory/4952-156-0x0000000003910000-0x000000000448A000-memory.dmp
memory/4952-164-0x0000000003910000-0x000000000448A000-memory.dmp