Analysis
- max time kernel
162s - max time network
174s - platform
windows10-2004_x64 - resource
win10v2004-20231215-en - resource tags
- submitted
02/01/2024, 23:51
General
- Target tuc4.exe
- Size 4.4MB
- Sample240102-3v5wxaedd9
- SHA256 9581ec377f2622120a2ad56ef162c292c8fc5775cbc42ed3e8dbf565efca0d31
Malware Config
Signatures
- Executes dropped EXE 3 IoCs
- Loads dropped DLL 3 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 50 IoCs
- Runs net.exe
- Suspicious use of FindShellTrayWindow 1 IoCs
- Suspicious use of WriteProcessMemory 15 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\tuc4.exe"C:\Users\Admin\AppData\Local\Temp\tuc4.exe"1⤵
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\is-S3MA9.tmp\tuc4.tmp"C:\Users\Admin\AppData\Local\Temp\is-S3MA9.tmp\tuc4.tmp" /SL5="$A01C6,4322369,54272,C:\Users\Admin\AppData\Local\Temp\tuc4.exe"2⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\net.exe"C:\Windows\system32\net.exe" helpmsg 1233⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\net1.exeC:\Windows\system32\net1 helpmsg 1234⤵
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C:\Program Files (x86)\Java FAX Extension Class\javafax.exe"C:\Program Files (x86)\Java FAX Extension Class\javafax.exe" -i3⤵
- Executes dropped EXE
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C:\Program Files (x86)\Java FAX Extension Class\javafax.exe"C:\Program Files (x86)\Java FAX Extension Class\javafax.exe" -s3⤵
- Executes dropped EXE
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
javafax.exe
_iscrypt.dll
_isdecmp.dll
tuc4.tmp
memory/112-8-0x0000000000400000-0x0000000000414000-memory.dmp
memory/112-3-0x0000000000400000-0x0000000000414000-memory.dmp
memory/112-26-0x0000000000400000-0x0000000000414000-memory.dmp
memory/112-1-0x0000000000400000-0x0000000000414000-memory.dmp
memory/112-0-0x0000000000400000-0x0000000000414000-memory.dmp
memory/1856-9-0x0000000000590000-0x0000000000591000-memory.dmp
memory/1856-136-0x0000000000590000-0x0000000000591000-memory.dmp
memory/1856-25-0x0000000000400000-0x00000000004BC000-memory.dmp
memory/1856-128-0x0000000000400000-0x00000000004BC000-memory.dmp
memory/3800-148-0x0000000000400000-0x000000000053A000-memory.dmp
memory/3800-151-0x0000000000400000-0x000000000053A000-memory.dmp
memory/3800-171-0x0000000000400000-0x000000000053A000-memory.dmp
memory/3800-169-0x00000000007D0000-0x000000000086F000-memory.dmp
memory/3800-138-0x0000000000400000-0x000000000053A000-memory.dmp
memory/3800-141-0x0000000000400000-0x000000000053A000-memory.dmp
memory/3800-144-0x0000000000400000-0x000000000053A000-memory.dmp
memory/3800-145-0x0000000000400000-0x000000000053A000-memory.dmp
memory/3800-167-0x0000000000400000-0x000000000053A000-memory.dmp
memory/3800-164-0x0000000000400000-0x000000000053A000-memory.dmp
memory/3800-154-0x0000000000400000-0x000000000053A000-memory.dmp
memory/3800-157-0x0000000000400000-0x000000000053A000-memory.dmp
memory/3800-158-0x00000000007D0000-0x000000000086F000-memory.dmp
memory/3800-159-0x00000000007D0000-0x000000000086F000-memory.dmp
memory/4616-131-0x0000000000400000-0x000000000053A000-memory.dmp
memory/4616-127-0x0000000000400000-0x000000000053A000-memory.dmp
memory/4616-129-0x0000000000400000-0x000000000053A000-memory.dmp
memory/4616-134-0x0000000000400000-0x000000000053A000-memory.dmp