Analysis
- max time kernel
59s - max time network
63s - platform
windows7_x64 - resource
win7-20220901-en - resource tags
- submitted
22/11/2022, 05:17
General
- Target file.exe
- Size 1.3MB
- Sample221122-fypmrsbc38
- SHA256 df54de4b0ea08536e463b18e1b2d7bb11b0c2e08d1a4c551008cb146f2c02240
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 9 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-R4EUK.tmp\is-7TCB9.tmp"C:\Users\Admin\AppData\Local\Temp\is-R4EUK.tmp\is-7TCB9.tmp" /SL4 $80022 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1089485 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)\PrintFolders\PrintFolders.exe"C:\Program Files (x86)\PrintFolders\PrintFolders.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}\ysNYxecHOG4jM.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "PrintFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\PrintFolders.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "PrintFolders.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
PrintFolders.exe
PrintFolders.exe
is-7TCB9.tmp
is-7TCB9.tmp
ysNYxecHOG4jM.exe
ysNYxecHOG4jM.exe
PrintFolders.exe
PrintFolders.exe
PrintFolders.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-7TCB9.tmp
ysNYxecHOG4jM.exe
ysNYxecHOG4jM.exe
ysNYxecHOG4jM.exe
memory/972-90-0x00000000030C0000-0x0000000004038000-memory.dmp
memory/972-73-0x00000000030C0000-0x0000000004038000-memory.dmp
memory/1600-55-0x0000000000400000-0x0000000000413000-memory.dmp
memory/1600-99-0x0000000000400000-0x0000000000413000-memory.dmp
memory/1600-72-0x0000000000400000-0x0000000000413000-memory.dmp
memory/1600-54-0x0000000076461000-0x0000000076463000-memory.dmp
memory/1616-78-0x0000000000400000-0x0000000001378000-memory.dmp
memory/1616-86-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1616-77-0x0000000000400000-0x0000000001378000-memory.dmp
memory/1616-91-0x0000000000400000-0x0000000001378000-memory.dmp
memory/1616-92-0x00000000017D0000-0x0000000002748000-memory.dmp
memory/1616-93-0x0000000000400000-0x0000000001378000-memory.dmp
memory/1616-76-0x00000000017D0000-0x0000000002748000-memory.dmp
memory/1616-75-0x00000000017D0000-0x0000000002748000-memory.dmp
memory/1616-98-0x0000000000400000-0x0000000001378000-memory.dmp
memory/1616-74-0x0000000000400000-0x0000000001378000-memory.dmp