Analysis
- max time kernel
59s - max time network
60s - platform
windows7_x64 - resource
win7-20221111-en - resource tags
- submitted
23/12/2022, 07:01
General
- Target file.exe
- Size 1.9MB
- Sample221223-hs8jssbb71
- SHA256 c32f88179090263121c467ebe00e1cfbbd6a8df66fd7e4f2497fbd6e0432998e
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-V80MR.tmp\is-S0OOT.tmp"C:\Users\Admin\AppData\Local\Temp\is-V80MR.tmp\is-S0OOT.tmp" /SL4 $70122 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1721411 1331202⤵
- 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\SplitFiles118.exe"C:\Program Files (x86)\Split Files\SplitFiles118.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}\Qmb7qc.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles118.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles118.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles118.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
SplitFiles118.exe
SplitFiles118.exe
is-S0OOT.tmp
is-S0OOT.tmp
Qmb7qc.exe
Qmb7qc.exe
SplitFiles118.exe
SplitFiles118.exe
SplitFiles118.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-S0OOT.tmp
Qmb7qc.exe
Qmb7qc.exe
Qmb7qc.exe
memory/652-78-0x0000000000400000-0x000000000154D000-memory.dmp
memory/652-87-0x0000000000400000-0x000000000154D000-memory.dmp
memory/652-75-0x0000000001BD0000-0x0000000002D1D000-memory.dmp
memory/652-76-0x0000000001BD0000-0x0000000002D1D000-memory.dmp
memory/652-77-0x0000000000400000-0x000000000154D000-memory.dmp
memory/652-97-0x0000000000400000-0x000000000154D000-memory.dmp
memory/652-93-0x0000000000400000-0x000000000154D000-memory.dmp
memory/652-89-0x0000000010000000-0x000000001001B000-memory.dmp
memory/652-74-0x0000000000400000-0x000000000154D000-memory.dmp
memory/652-88-0x0000000001BD0000-0x0000000002D1D000-memory.dmp
memory/1276-55-0x0000000000400000-0x0000000000427000-memory.dmp
memory/1276-54-0x0000000075E01000-0x0000000075E03000-memory.dmp
memory/1276-67-0x0000000000400000-0x0000000000427000-memory.dmp
memory/1276-98-0x0000000000400000-0x0000000000427000-memory.dmp
memory/1724-86-0x0000000003940000-0x0000000004A8D000-memory.dmp
memory/1724-70-0x0000000003940000-0x0000000004A8D000-memory.dmp