Analysis
- max time kernel
58s - max time network
60s - platform
windows7_x64 - resource
win7-20221111-en - resource tags
- submitted
05/01/2023, 17:07
General
- Target file.exe
- Size 2.0MB
- Sample230105-vmze6acf48
- SHA256 2dea99b05ba78bb4ae50449ee132fdbf4f30876de3e09e3b72f94e2e023dc320
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-7MR4E.tmp\is-HSQFC.tmp"C:\Users\Admin\AppData\Local\Temp\is-7MR4E.tmp\is-HSQFC.tmp" /SL4 $70126 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1833469 1704962⤵
- 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\SplitFiles131.exe"C:\Program Files (x86)\Split Files\SplitFiles131.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}\AVU3a4l.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles131.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles131.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles131.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
SplitFiles131.exe
SplitFiles131.exe
is-HSQFC.tmp
is-HSQFC.tmp
AVU3a4l.exe
AVU3a4l.exe
SplitFiles131.exe
SplitFiles131.exe
SplitFiles131.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-HSQFC.tmp
AVU3a4l.exe
AVU3a4l.exe
AVU3a4l.exe
memory/1096-55-0x0000000000400000-0x0000000000430000-memory.dmp
memory/1096-97-0x0000000000400000-0x0000000000430000-memory.dmp
memory/1096-54-0x0000000075671000-0x0000000075673000-memory.dmp
memory/1096-68-0x0000000000400000-0x0000000000430000-memory.dmp
memory/1648-76-0x0000000000400000-0x0000000001558000-memory.dmp
memory/1648-77-0x0000000000400000-0x0000000001558000-memory.dmp
memory/1648-75-0x0000000001E90000-0x0000000002FE8000-memory.dmp
memory/1648-95-0x0000000000400000-0x0000000001558000-memory.dmp
memory/1648-74-0x0000000000400000-0x0000000001558000-memory.dmp
memory/1648-85-0x0000000000400000-0x0000000001558000-memory.dmp
memory/1648-87-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1648-91-0x0000000000400000-0x0000000001558000-memory.dmp
memory/2044-86-0x0000000003850000-0x00000000049A8000-memory.dmp
memory/2044-70-0x0000000003850000-0x00000000049A8000-memory.dmp