Analysis
- max time kernel
54s - max time network
56s - platform
windows7_x64 - resource
win7-20221111-en - resource tags
- submitted
13/01/2023, 00:33
General
- Target file.exe
- Size 1.5MB
- Sample230113-av65racb65
- SHA256 48308397969bc470c24e9e3f1449683aa29207a1648d9002925db56c78aaa6f5
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 17 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-AK4ES.tmp\file.tmp"C:\Users\Admin\AppData\Local\Temp\is-AK4ES.tmp\file.tmp" /SL5="$7012C,1328040,483328,C:\Users\Admin\AppData\Local\Temp\file.exe"2⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\Mit Files\MitFiles138.exe"C:\Program Files (x86)\Mit Files\MitFiles138.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}\EcL56f.exe4⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "MitFiles138.exe" /f & erase "C:\Program Files (x86)\Mit Files\MitFiles138.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "MitFiles138.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
MitFiles138.exe
MitFiles138.exe
file.tmp
file.tmp
EcL56f.exe
MitFiles138.exe
file.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
EcL56f.exe
memory/1184-81-0x0000000003620000-0x00000000045E2000-memory.dmp
memory/1184-69-0x0000000003620000-0x00000000045E2000-memory.dmp
memory/2020-68-0x0000000000400000-0x000000000047D000-memory.dmp
memory/2020-54-0x0000000074FD1000-0x0000000074FD3000-memory.dmp
memory/2020-87-0x0000000000400000-0x000000000047D000-memory.dmp
memory/2020-55-0x0000000000400000-0x000000000047D000-memory.dmp
memory/2032-73-0x0000000000400000-0x00000000013C2000-memory.dmp
memory/2032-77-0x0000000010000000-0x000000001001B000-memory.dmp
memory/2032-82-0x0000000000400000-0x00000000013C2000-memory.dmp
memory/2032-83-0x0000000000400000-0x00000000013C2000-memory.dmp
memory/2032-71-0x0000000000400000-0x00000000013C2000-memory.dmp
memory/2032-70-0x0000000000400000-0x00000000013C2000-memory.dmp
memory/2032-86-0x0000000000400000-0x00000000013C2000-memory.dmp