Analysis
- max time kernel
152s - max time network
189s - platform
windows10-2004_x64 - resource
win10v2004-20221111-en - resource tags
- submitted
02/12/2022, 12:02
General
- Target file.exe
- Size 2.1MB
- Sample221202-n7g82sef36
- SHA256 ef463c8b79c5b6021e14519db333888b393b1f40296e0cd12e8f2175d03667ef
Malware Config
Extracted
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nymaim
-
45.139.105.171
-
85.31.46.167
Signatures
- NyMaim
NyMaim is a malware with various capabilities written in C++ and first seen in 2013.
- Executes dropped EXE 3 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.
- Drops file in Program Files directory 9 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Suspicious behavior: EnumeratesProcesses 6 IoCs
- Suspicious behavior: GetForegroundWindowSpam 1 IoCs
- Suspicious use of WriteProcessMemory 9 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:\Users\Admin\AppData\Local\Temp\is-MD5KG.tmp\is-74TBO.tmp"C:\Users\Admin\AppData\Local\Temp\is-MD5KG.tmp\is-74TBO.tmp" /SL4 $90046 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1954074 517122⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\PrintFolders\PrintFolders.exe"C:\Program Files (x86)\PrintFolders\PrintFolders.exe"3⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\GVRCmu.exe4⤵
- Executes dropped EXE
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
PrintFolders.exe
PrintFolders.exe
is-74TBO.tmp
is-74TBO.tmp
_iscrypt.dll
GVRCmu.exe
GVRCmu.exe
memory/1364-137-0x0000000000400000-0x0000000000413000-memory.dmp
memory/1364-132-0x0000000000400000-0x0000000000413000-memory.dmp
memory/2176-142-0x0000000000400000-0x0000000001552000-memory.dmp
memory/2176-143-0x0000000000400000-0x0000000001552000-memory.dmp
memory/2176-144-0x0000000000400000-0x0000000001552000-memory.dmp
memory/2176-148-0x0000000000400000-0x0000000001552000-memory.dmp
memory/2176-149-0x0000000010000000-0x000000001001B000-memory.dmp