Analysis
- max time kernel
139s - max time network
126s - platform
windows10-2004_x64 - resource
win10v2004-20240426-en - resource tags
- submitted
08/05/2024, 15:27
General
- Target 2024-05-08_b44f7cefb0bdc2f4abf8099ba54dd9fc_avoslocker.exe
- Size 2.5MB
- Sample240508-svv2labb4s
- SHA256 cecd477c04b8457ed6f31b9904ec9b67dc58971a7523a16f4fbc678c1c5f1a1a
Malware Config
Signatures
- Office macro that triggers on suspicious action 1 IoCs
Office document macro which triggers in special circumstances - often malicious.
- Suspicious Office macro 1 IoCs
Office document equipped with macros.
- Loads dropped DLL 1 IoCs
- Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs
Bootkits write to the MBR to gain persistence at a level below the operating system.
- Checks processor information in registry 2 TTPs 3 IoCs
Processor information is often read in order to detect sandboxing environments.
- Enumerates system info in registry 2 TTPs 3 IoCs
- Suspicious behavior: AddClipboardFormatListener 1 IoCs
- Suspicious use of SetWindowsHookEx 14 IoCs
- Suspicious use of WriteProcessMemory 2 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\2024-05-08_b44f7cefb0bdc2f4abf8099ba54dd9fc_avoslocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-05-08_b44f7cefb0bdc2f4abf8099ba54dd9fc_avoslocker.exe"1⤵
-
C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" /automation -Embedding1⤵
- Loads dropped DLL
- Writes to the Master Boot Record (MBR)
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Windows\splwow64.exeC:\Windows\splwow64.exe 122882⤵
-
-
C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k PrintWorkflow -s PrintWorkflowUserSvc1⤵
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
2024-05-08_b44f7cefb0bdc2f4abf8099ba54dd9fc_avoslocker.xlsm
execmdline
xcellstub.dll
zigbz7v2.xls
memory/2820-12-0x00007FFE5CE50000-0x00007FFE5D045000-memory.dmp
memory/2820-16-0x00007FFE5CE50000-0x00007FFE5D045000-memory.dmp
memory/2820-6-0x00007FFE5CE50000-0x00007FFE5D045000-memory.dmp
memory/2820-9-0x00007FFE5CE50000-0x00007FFE5D045000-memory.dmp
memory/2820-8-0x00007FFE5CE50000-0x00007FFE5D045000-memory.dmp
memory/2820-7-0x00007FFE5CE50000-0x00007FFE5D045000-memory.dmp
memory/2820-10-0x00007FFE1A710000-0x00007FFE1A720000-memory.dmp
memory/2820-13-0x00007FFE5CE50000-0x00007FFE5D045000-memory.dmp
memory/2820-14-0x00007FFE5CE50000-0x00007FFE5D045000-memory.dmp
memory/2820-15-0x00007FFE5CE50000-0x00007FFE5D045000-memory.dmp
memory/2820-0-0x00007FFE1CED0000-0x00007FFE1CEE0000-memory.dmp
memory/2820-5-0x00007FFE5CEED000-0x00007FFE5CEEE000-memory.dmp
memory/2820-11-0x00007FFE5CE50000-0x00007FFE5D045000-memory.dmp
memory/2820-18-0x00007FFE5CE50000-0x00007FFE5D045000-memory.dmp
memory/2820-19-0x00007FFE5CE50000-0x00007FFE5D045000-memory.dmp
memory/2820-17-0x00007FFE1A710000-0x00007FFE1A720000-memory.dmp
memory/2820-21-0x00007FFE5CE50000-0x00007FFE5D045000-memory.dmp
memory/2820-20-0x00007FFE5CE50000-0x00007FFE5D045000-memory.dmp
memory/2820-22-0x00007FFE5CE50000-0x00007FFE5D045000-memory.dmp
memory/2820-4-0x00007FFE1CED0000-0x00007FFE1CEE0000-memory.dmp
memory/2820-2-0x00007FFE1CED0000-0x00007FFE1CEE0000-memory.dmp
memory/2820-3-0x00007FFE1CED0000-0x00007FFE1CEE0000-memory.dmp
memory/2820-1-0x00007FFE1CED0000-0x00007FFE1CEE0000-memory.dmp
memory/2820-76-0x00007FFE5CE50000-0x00007FFE5D045000-memory.dmp