Analysis
- max time kernel
102s - max time network
110s - platform
windows7_x64 - resource
win7-20220812-en - resource tags
- submitted
31/10/2022, 07:31
General
- Target file.exe
- Size 2.5MB
- Sample221031-jcc9dsbbfq
- SHA256 da0b391c1914133efa99012ed73462d96fadaac4d6105db5180bd4c24d5fc583
Malware Config
Extracted
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nymaim
-
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 6 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 12 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 1 IoCs
- Suspicious use of WriteProcessMemory 23 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-FG2QT.tmp\is-1GSOF.tmp"C:\Users\Admin\AppData\Local\Temp\is-FG2QT.tmp\is-1GSOF.tmp" /SL4 $6012A "C:\Users\Admin\AppData\Local\Temp\file.exe" 2358165 527362⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\fhSearcher\fhsearcher65.exe"C:\Program Files (x86)\fhSearcher\fhsearcher65.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}\pTxhrckAprMpg.exe4⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "fhsearcher65.exe" /f & erase "C:\Program Files (x86)\fhSearcher\fhsearcher65.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "fhsearcher65.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
fhsearcher65.exe
fhsearcher65.exe
is-1GSOF.tmp
is-1GSOF.tmp
pTxhrckAprMpg.exe
fhsearcher65.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-1GSOF.tmp
pTxhrckAprMpg.exe
memory/944-76-0x0000000000400000-0x00000000015A2000-memory.dmp
memory/944-75-0x0000000000400000-0x00000000015A2000-memory.dmp
memory/944-84-0x0000000000400000-0x00000000015A2000-memory.dmp
memory/944-71-0x0000000000400000-0x00000000015A2000-memory.dmp
memory/944-73-0x0000000000400000-0x00000000015A2000-memory.dmp
memory/944-87-0x0000000000400000-0x00000000015A2000-memory.dmp
memory/944-80-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1160-66-0x0000000000400000-0x0000000000414000-memory.dmp
memory/1160-54-0x0000000075A91000-0x0000000075A93000-memory.dmp
memory/1160-57-0x0000000000400000-0x0000000000414000-memory.dmp
memory/1160-55-0x0000000000400000-0x0000000000414000-memory.dmp
memory/1160-88-0x0000000000400000-0x0000000000414000-memory.dmp
memory/1900-74-0x0000000003220000-0x00000000043C2000-memory.dmp
memory/1900-70-0x0000000003220000-0x00000000043C2000-memory.dmp