Analysis
- max time kernel
143s - max time network
135s - platform
windows7_x64 - resource
win7-20231129-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 6 IoCs
- Unexpected DNS network traffic destination 1 IoCs
Network traffic to other servers than the configured DNS servers was detected on the DNS port.
- 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 23 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\tuc4.exe"C:\Users\Admin\AppData\Local\Temp\tuc4.exe"1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\is-N3Q00.tmp\tuc4.tmp"C:\Users\Admin\AppData\Local\Temp\is-N3Q00.tmp\tuc4.tmp" /SL5="$4001C,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
_shfoldr.dll
tuc4.tmp
memory/1824-10-0x0000000000240000-0x0000000000241000-memory.dmp
memory/1824-124-0x0000000003890000-0x00000000039CA000-memory.dmp
memory/1824-139-0x0000000003890000-0x00000000039CA000-memory.dmp
memory/1824-138-0x0000000000240000-0x0000000000241000-memory.dmp
memory/1824-136-0x0000000000400000-0x00000000004BC000-memory.dmp
memory/2360-135-0x0000000000400000-0x0000000000414000-memory.dmp
memory/2360-0-0x0000000000400000-0x0000000000414000-memory.dmp
memory/2632-126-0x0000000000400000-0x000000000053A000-memory.dmp
memory/2632-127-0x0000000000400000-0x000000000053A000-memory.dmp
memory/2632-125-0x0000000000400000-0x000000000053A000-memory.dmp
memory/2632-130-0x0000000000400000-0x000000000053A000-memory.dmp
memory/2848-156-0x0000000000400000-0x000000000053A000-memory.dmp
memory/2848-162-0x0000000000400000-0x000000000053A000-memory.dmp
memory/2848-132-0x0000000000400000-0x000000000053A000-memory.dmp
memory/2848-142-0x0000000000400000-0x000000000053A000-memory.dmp
memory/2848-143-0x0000000000400000-0x000000000053A000-memory.dmp
memory/2848-146-0x0000000000400000-0x000000000053A000-memory.dmp
memory/2848-149-0x0000000000400000-0x000000000053A000-memory.dmp
memory/2848-152-0x0000000000400000-0x000000000053A000-memory.dmp
memory/2848-155-0x00000000020A0000-0x000000000213F000-memory.dmp
memory/2848-134-0x0000000000400000-0x000000000053A000-memory.dmp
memory/2848-157-0x00000000020A0000-0x000000000213F000-memory.dmp
memory/2848-137-0x0000000000400000-0x000000000053A000-memory.dmp
memory/2848-165-0x0000000000400000-0x000000000053A000-memory.dmp
memory/2848-166-0x00000000020A0000-0x000000000213F000-memory.dmp
memory/2848-169-0x0000000000400000-0x000000000053A000-memory.dmp
memory/2848-172-0x0000000000400000-0x000000000053A000-memory.dmp
memory/2848-175-0x0000000000400000-0x000000000053A000-memory.dmp
memory/2848-178-0x0000000000400000-0x000000000053A000-memory.dmp
memory/2848-179-0x00000000020A0000-0x000000000213F000-memory.dmp
memory/2848-180-0x00000000020A0000-0x000000000213F000-memory.dmp
memory/2848-184-0x0000000000400000-0x000000000053A000-memory.dmp
memory/2848-187-0x0000000000400000-0x000000000053A000-memory.dmp