Analysis
- max time kernel
61s - max time network
63s - platform
windows7_x64 - resource
win7-20221111-en - resource tags
- submitted
26/12/2022, 04:09
General
- Target file.exe
- Size 1.9MB
- Sample221226-eqstsaff2z
- SHA256 8efeeba5117123629c238cff0ca2a3048b6c14db247ecb8f3e899400bae8743b
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-LNF62.tmp\is-7HAFF.tmp"C:\Users\Admin\AppData\Local\Temp\is-LNF62.tmp\is-7HAFF.tmp" /SL4 $80022 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1779271 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\SplitFiles121.exe"C:\Program Files (x86)\Split Files\SplitFiles121.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}\mCWc14jE5xJTsV.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles121.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles121.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles121.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
SplitFiles121.exe
SplitFiles121.exe
is-7HAFF.tmp
is-7HAFF.tmp
mCWc14jE5xJTsV.exe
mCWc14jE5xJTsV.exe
SplitFiles121.exe
SplitFiles121.exe
SplitFiles121.exe
is-7HAFF.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
mCWc14jE5xJTsV.exe
mCWc14jE5xJTsV.exe
mCWc14jE5xJTsV.exe
memory/604-98-0x0000000000400000-0x0000000000454000-memory.dmp
memory/604-66-0x0000000000400000-0x0000000000454000-memory.dmp
memory/604-55-0x0000000000400000-0x0000000000454000-memory.dmp
memory/604-54-0x00000000757E1000-0x00000000757E3000-memory.dmp
memory/760-78-0x0000000000400000-0x0000000001551000-memory.dmp
memory/760-74-0x0000000000400000-0x0000000001551000-memory.dmp
memory/760-92-0x0000000000400000-0x0000000001551000-memory.dmp
memory/760-75-0x0000000001B00000-0x0000000002C51000-memory.dmp
memory/760-77-0x0000000000400000-0x0000000001551000-memory.dmp
memory/760-76-0x0000000001B00000-0x0000000002C51000-memory.dmp
memory/760-97-0x0000000000400000-0x0000000001551000-memory.dmp
memory/760-87-0x0000000000400000-0x0000000001551000-memory.dmp
memory/760-88-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1476-86-0x0000000003770000-0x00000000048C1000-memory.dmp
memory/1476-69-0x0000000003770000-0x00000000048C1000-memory.dmp