Analysis
- max time kernel
64s - max time network
67s - platform
windows7_x64 - resource
win7-20220812-en - resource tags
- submitted
21/12/2022, 01:01
General
- Target file.exe
- Size 1.8MB
- Sample221221-bc8rasbd57
- SHA256 c073bbfd4fd2c5d6561ca04ae8ea76db95620c808425d1f724dfa172c17d49a8
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-433E4.tmp\is-7GK6G.tmp"C:\Users\Admin\AppData\Local\Temp\is-433E4.tmp\is-7GK6G.tmp" /SL4 $70022 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1682807 517122⤵
- 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\SplitFiles.exe"C:\Program Files (x86)\Split Files\SplitFiles.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}\FQlZYQ.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles.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
SplitFiles.exe
SplitFiles.exe
is-7GK6G.tmp
is-7GK6G.tmp
FQlZYQ.exe
FQlZYQ.exe
SplitFiles.exe
SplitFiles.exe
SplitFiles.exe
is-7GK6G.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
FQlZYQ.exe
FQlZYQ.exe
FQlZYQ.exe
memory/576-97-0x0000000000400000-0x0000000000413000-memory.dmp
memory/576-54-0x0000000075911000-0x0000000075913000-memory.dmp
memory/576-65-0x0000000000400000-0x0000000000413000-memory.dmp
memory/576-55-0x0000000000400000-0x0000000000413000-memory.dmp
memory/980-87-0x0000000010000000-0x000000001001B000-memory.dmp
memory/980-91-0x0000000000400000-0x000000000153E000-memory.dmp
memory/980-77-0x0000000000400000-0x000000000153E000-memory.dmp
memory/980-95-0x0000000000400000-0x000000000153E000-memory.dmp
memory/980-76-0x0000000001AD0000-0x0000000002C0E000-memory.dmp
memory/980-75-0x0000000001AD0000-0x0000000002C0E000-memory.dmp
memory/980-74-0x0000000000400000-0x000000000153E000-memory.dmp
memory/980-86-0x0000000000400000-0x000000000153E000-memory.dmp
memory/980-78-0x0000000000400000-0x000000000153E000-memory.dmp
memory/1956-73-0x00000000037A0000-0x00000000048DE000-memory.dmp