Analysis
- max time kernel
57s - max time network
58s - platform
windows7_x64 - resource
win7-20221111-en - resource tags
- submitted
22/12/2022, 23:31
General
- Target file.exe
- Size 1.8MB
- Sample221222-3hpddsfe23
- SHA256 b0cefcdca903547afa59d7bc788e29a60778b8c3500e3aaccbc8d6cab2bbc2f7
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-LSA7L.tmp\is-JPEKP.tmp"C:\Users\Admin\AppData\Local\Temp\is-LSA7L.tmp\is-JPEKP.tmp" /SL4 $70124 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1682048 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\SplitFiles117.exe"C:\Program Files (x86)\Split Files\SplitFiles117.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}\rYMap.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles117.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles117.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles117.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
SplitFiles117.exe
SplitFiles117.exe
is-JPEKP.tmp
is-JPEKP.tmp
rYMap.exe
rYMap.exe
SplitFiles117.exe
SplitFiles117.exe
SplitFiles117.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-JPEKP.tmp
rYMap.exe
rYMap.exe
rYMap.exe
memory/332-78-0x0000000000400000-0x0000000001530000-memory.dmp
memory/332-87-0x0000000000400000-0x0000000001530000-memory.dmp
memory/332-75-0x0000000001B70000-0x0000000002CA0000-memory.dmp
memory/332-76-0x0000000001B70000-0x0000000002CA0000-memory.dmp
memory/332-77-0x0000000000400000-0x0000000001530000-memory.dmp
memory/332-71-0x0000000000400000-0x0000000001530000-memory.dmp
memory/332-97-0x0000000000400000-0x0000000001530000-memory.dmp
memory/332-93-0x0000000000400000-0x0000000001530000-memory.dmp
memory/332-90-0x0000000001B70000-0x0000000002CA0000-memory.dmp
memory/332-88-0x0000000010000000-0x000000001001B000-memory.dmp
memory/836-55-0x0000000000400000-0x0000000000427000-memory.dmp
memory/836-54-0x0000000076AE1000-0x0000000076AE3000-memory.dmp
memory/836-68-0x0000000000400000-0x0000000000427000-memory.dmp
memory/836-98-0x0000000000400000-0x0000000000427000-memory.dmp
memory/1076-86-0x0000000003A00000-0x0000000004B30000-memory.dmp
memory/1076-70-0x0000000003A00000-0x0000000004B30000-memory.dmp