Analysis
- max time kernel
64s - max time network
68s - platform
windows7_x64 - resource
win7-20220901-en - resource tags
- submitted
24/11/2022, 04:47
General
- Target file.exe
- Size 1.2MB
- Sample221124-fejbmsdb9x
- SHA256 b63bf49e4afe8dc59cf0e0a45cdbc340a5c7ef7fe312d831c9cdc3bc816109f0
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 10 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.
- Kills process with taskkill 1 IoCs
- Suspicious behavior: EnumeratesProcesses 3 IoCs
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of WriteProcessMemory 35 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-KQI8H.tmp\is-91B22.tmp"C:\Users\Admin\AppData\Local\Temp\is-KQI8H.tmp\is-91B22.tmp" /SL4 $70124 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1048761 517122⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- 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
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\uAaSRRI.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "PrintFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\PrintFolders.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "PrintFolders.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
PrintFolders.exe
PrintFolders.exe
is-91B22.tmp
is-91B22.tmp
uAaSRRI.exe
uAaSRRI.exe
PrintFolders.exe
PrintFolders.exe
PrintFolders.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-91B22.tmp
uAaSRRI.exe
uAaSRRI.exe
uAaSRRI.exe
memory/676-75-0x00000000018B0000-0x0000000002822000-memory.dmp
memory/676-91-0x0000000000400000-0x0000000001372000-memory.dmp
memory/676-76-0x00000000018B0000-0x0000000002822000-memory.dmp
memory/676-77-0x0000000000400000-0x0000000001372000-memory.dmp
memory/676-78-0x0000000000400000-0x0000000001372000-memory.dmp
memory/676-74-0x0000000000400000-0x0000000001372000-memory.dmp
memory/676-96-0x0000000000400000-0x0000000001372000-memory.dmp
memory/676-93-0x0000000000400000-0x0000000001372000-memory.dmp
memory/676-92-0x00000000018B0000-0x0000000002822000-memory.dmp
memory/676-86-0x0000000010000000-0x000000001001B000-memory.dmp
memory/900-90-0x0000000003080000-0x0000000003FF2000-memory.dmp
memory/900-73-0x0000000003080000-0x0000000003FF2000-memory.dmp
memory/2024-54-0x00000000766D1000-0x00000000766D3000-memory.dmp
memory/2024-65-0x0000000000400000-0x0000000000413000-memory.dmp
memory/2024-55-0x0000000000400000-0x0000000000413000-memory.dmp
memory/2024-98-0x0000000000400000-0x0000000000413000-memory.dmp