Analysis
- max time kernel
59s - max time network
63s - platform
windows7_x64 - resource
win7-20220901-en - resource tags
- submitted
12/11/2022, 03:31
General
- Target file.exe
- Size 2.9MB
- Sample221112-d2388add97
- SHA256 ffdec04e1631c3f462448a1da7f6fd665b4e9235cccad31028cdf396fe2c68fb
Malware Config
Extracted
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nymaim
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45.139.105.171
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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 6 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 12 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Kills process with taskkill 1 IoCs
- Suspicious behavior: EnumeratesProcesses 3 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 23 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\is-0Q20A.tmp\is-8C78Q.tmp"C:\Users\Admin\AppData\Local\Temp\is-0Q20A.tmp\is-8C78Q.tmp" /SL4 $70124 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2795149 527362⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\gfSearcher\gfsearcher77.exe"C:\Program Files (x86)\gfSearcher\gfsearcher77.exe"3⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\nV1Dj.exe4⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "gfsearcher77.exe" /f & erase "C:\Program Files (x86)\gfSearcher\gfsearcher77.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "gfsearcher77.exe" /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
gfsearcher77.exe
gfsearcher77.exe
is-8C78Q.tmp
is-8C78Q.tmp
nV1Dj.exe
gfsearcher77.exe
is-8C78Q.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
nV1Dj.exe
memory/988-69-0x00000000030E0000-0x000000000432F000-memory.dmp
memory/1124-70-0x0000000000400000-0x000000000164F000-memory.dmp
memory/1124-82-0x0000000000400000-0x000000000164F000-memory.dmp
memory/1124-71-0x0000000000400000-0x000000000164F000-memory.dmp
memory/1124-73-0x0000000000400000-0x000000000164F000-memory.dmp
memory/1124-85-0x0000000000400000-0x000000000164F000-memory.dmp
memory/1124-77-0x0000000000400000-0x000000000164F000-memory.dmp
memory/1124-78-0x0000000010000000-0x000000001001B000-memory.dmp
memory/2032-54-0x00000000766D1000-0x00000000766D3000-memory.dmp
memory/2032-68-0x0000000000400000-0x0000000000414000-memory.dmp
memory/2032-86-0x0000000000400000-0x0000000000414000-memory.dmp
memory/2032-55-0x0000000000400000-0x0000000000414000-memory.dmp