Analysis
- max time kernel
56s - max time network
58s - platform
windows7_x64 - resource
win7-20221111-en - resource tags
- submitted
29/12/2022, 06:44
General
- Target file.exe
- Size 1.7MB
- Sample221229-hhgnbsce39
- SHA256 46bfe22fa00aba9e58f6e7afb790b0a7ad7c31e57260fbc499162648375a39e5
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-N29BG.tmp\is-V2I97.tmp"C:\Users\Admin\AppData\Local\Temp\is-N29BG.tmp\is-V2I97.tmp" /SL4 $90126 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1561047 967682⤵
- 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\SplitFiles124.exe"C:\Program Files (x86)\Split Files\SplitFiles124.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}\EjqZnu.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles124.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles124.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles124.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
SplitFiles124.exe
SplitFiles124.exe
is-V2I97.tmp
is-V2I97.tmp
EjqZnu.exe
EjqZnu.exe
SplitFiles124.exe
SplitFiles124.exe
SplitFiles124.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-V2I97.tmp
EjqZnu.exe
EjqZnu.exe
EjqZnu.exe
memory/664-86-0x0000000010000000-0x000000001001B000-memory.dmp
memory/664-74-0x0000000000400000-0x000000000151A000-memory.dmp
memory/664-75-0x0000000001A70000-0x0000000002B8A000-memory.dmp
memory/664-76-0x0000000001A70000-0x0000000002B8A000-memory.dmp
memory/664-77-0x0000000000400000-0x000000000151A000-memory.dmp
memory/664-78-0x0000000000400000-0x000000000151A000-memory.dmp
memory/664-96-0x0000000000400000-0x000000000151A000-memory.dmp
memory/664-91-0x0000000000400000-0x000000000151A000-memory.dmp
memory/1232-90-0x0000000003820000-0x000000000493A000-memory.dmp
memory/1232-73-0x0000000003820000-0x000000000493A000-memory.dmp
memory/1564-65-0x0000000000400000-0x000000000041E000-memory.dmp
memory/1564-55-0x0000000000400000-0x000000000041E000-memory.dmp
memory/1564-54-0x0000000076581000-0x0000000076583000-memory.dmp
memory/1564-97-0x0000000000400000-0x000000000041E000-memory.dmp