Analysis
- max time kernel
61s - max time network
64s - platform
windows7_x64 - resource
win7-20220812-en - resource tags
- submitted
23/12/2022, 05:16
General
- Target file.exe
- Size 2.0MB
- Sample221223-fx5mlaba9v
- SHA256 6b27aecd127da414437282906e7b742996015c5377f90e5e4548bd62fc85ca84
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-7P835.tmp\is-JBKJE.tmp"C:\Users\Admin\AppData\Local\Temp\is-7P835.tmp\is-JBKJE.tmp" /SL4 $60126 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1798793 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}\lcq1QCp.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-JBKJE.tmp
is-JBKJE.tmp
lcq1QCp.exe
lcq1QCp.exe
SplitFiles118.exe
SplitFiles118.exe
SplitFiles118.exe
is-JBKJE.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
lcq1QCp.exe
lcq1QCp.exe
lcq1QCp.exe
memory/564-72-0x0000000000400000-0x0000000000427000-memory.dmp
memory/564-98-0x0000000000400000-0x0000000000427000-memory.dmp
memory/564-54-0x0000000074AD1000-0x0000000074AD3000-memory.dmp
memory/564-55-0x0000000000400000-0x0000000000427000-memory.dmp
memory/1444-78-0x0000000000400000-0x000000000154D000-memory.dmp
memory/1444-92-0x00000000019E0000-0x0000000002B2D000-memory.dmp
memory/1444-77-0x0000000000400000-0x000000000154D000-memory.dmp
memory/1444-74-0x0000000000400000-0x000000000154D000-memory.dmp
memory/1444-76-0x00000000019E0000-0x0000000002B2D000-memory.dmp
memory/1444-75-0x00000000019E0000-0x0000000002B2D000-memory.dmp
memory/1444-86-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1444-96-0x0000000000400000-0x000000000154D000-memory.dmp
memory/1444-91-0x0000000000400000-0x000000000154D000-memory.dmp
memory/1724-73-0x0000000003980000-0x0000000004ACD000-memory.dmp
memory/1724-90-0x0000000003980000-0x0000000004ACD000-memory.dmp