Analysis
- max time kernel
55s - max time network
57s - platform
windows7_x64 - resource
win7-20221111-en - resource tags
- submitted
21/12/2022, 15:47
General
- Target file.exe
- Size 2.0MB
- Sample221221-s77adsce99
- SHA256 a60ebc15a0e60029427b0c8679fc811875b3a4f38e24ca141cc0f631cb2ac9ea
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 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-2ASL6.tmp\is-37DEK.tmp"C:\Users\Admin\AppData\Local\Temp\is-2ASL6.tmp\is-37DEK.tmp" /SL4 $80022 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1835378 3169282⤵
- 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\SplitFiles116.exe"C:\Program Files (x86)\Split Files\SplitFiles116.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}\Tk6CV.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles116.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles116.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles116.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
SplitFiles116.exe
SplitFiles116.exe
is-37DEK.tmp
is-37DEK.tmp
Tk6CV.exe
Tk6CV.exe
SplitFiles116.exe
SplitFiles116.exe
SplitFiles116.exe
is-37DEK.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
Tk6CV.exe
Tk6CV.exe
Tk6CV.exe
memory/560-78-0x0000000000400000-0x000000000154D000-memory.dmp
memory/560-87-0x0000000010000000-0x000000001001B000-memory.dmp
memory/560-76-0x0000000001C90000-0x0000000002DDD000-memory.dmp
memory/560-77-0x0000000000400000-0x000000000154D000-memory.dmp
memory/560-74-0x0000000000400000-0x000000000154D000-memory.dmp
memory/560-98-0x0000000000400000-0x000000000154D000-memory.dmp
memory/560-75-0x0000000001C90000-0x0000000002DDD000-memory.dmp
memory/560-94-0x0000000000400000-0x000000000154D000-memory.dmp
memory/560-93-0x0000000001C90000-0x0000000002DDD000-memory.dmp
memory/560-92-0x0000000001C90000-0x0000000002DDD000-memory.dmp
memory/560-91-0x0000000000400000-0x000000000154D000-memory.dmp
memory/1640-55-0x0000000000400000-0x0000000000454000-memory.dmp
memory/1640-68-0x0000000000400000-0x0000000000454000-memory.dmp
memory/1640-54-0x0000000074DA1000-0x0000000074DA3000-memory.dmp
memory/1640-100-0x0000000000400000-0x0000000000454000-memory.dmp
memory/1776-86-0x00000000037D0000-0x000000000491D000-memory.dmp
memory/1776-73-0x00000000037D0000-0x000000000491D000-memory.dmp