Analysis
- max time kernel
63s - max time network
67s - platform
windows7_x64 - resource
win7-20220901-en - resource tags
- submitted
30/12/2022, 10:31
General
- Target file.exe
- Size 2.0MB
- Sample221230-mkdfxafd72
- SHA256 a18221e513eafc00d9c5508ce2052b7067f620e516aa6cfd8217d1e7699c25aa
Malware Config
Extracted
-
nymaim
-
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 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 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-T3QCR.tmp\is-05T6M.tmp"C:\Users\Admin\AppData\Local\Temp\is-T3QCR.tmp\is-05T6M.tmp" /SL4 $70124 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1797683 3174402⤵
- 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)\Split Files\SplitFiles125.exe"C:\Program Files (x86)\Split Files\SplitFiles125.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}\VphlObA.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles125.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles125.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles125.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
SplitFiles125.exe
SplitFiles125.exe
is-05T6M.tmp
is-05T6M.tmp
VphlObA.exe
VphlObA.exe
SplitFiles125.exe
SplitFiles125.exe
SplitFiles125.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-05T6M.tmp
VphlObA.exe
VphlObA.exe
VphlObA.exe
memory/976-86-0x0000000003910000-0x0000000004A7A000-memory.dmp
memory/976-73-0x0000000003910000-0x0000000004A7A000-memory.dmp
memory/1064-98-0x0000000000400000-0x0000000000454000-memory.dmp
memory/1064-54-0x0000000075BB1000-0x0000000075BB3000-memory.dmp
memory/1064-55-0x0000000000400000-0x0000000000454000-memory.dmp
memory/1064-68-0x0000000000400000-0x0000000000454000-memory.dmp
memory/1608-74-0x0000000000400000-0x000000000156A000-memory.dmp
memory/1608-75-0x0000000001B60000-0x0000000002CCA000-memory.dmp
memory/1608-78-0x0000000000400000-0x000000000156A000-memory.dmp
memory/1608-77-0x0000000000400000-0x000000000156A000-memory.dmp
memory/1608-87-0x0000000000400000-0x000000000156A000-memory.dmp
memory/1608-88-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1608-92-0x0000000000400000-0x000000000156A000-memory.dmp
memory/1608-97-0x0000000000400000-0x000000000156A000-memory.dmp
memory/1608-76-0x0000000001B60000-0x0000000002CCA000-memory.dmp