Analysis
- max time kernel
297s - max time network
294s - platform
windows10-2004_x64 - resource
win10v2004-20230703-en - resource tags
- submitted
12/07/2023, 10:04
General
- Target pdf.exe
- Size 357KB
- Sample230712-l4dekscg42
- SHA256 dcd849401b6834b4c36006567cbf2e9bcc2093849432a104ff43d178867d397d
Malware Config
Signatures
- Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
- Checks QEMU agent file 2 TTPs 2 IoCs
Checks presence of QEMU agent, possibly to detect virtualization.
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Loads dropped DLL 1 IoCs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Legitimate hosting services abused for malware hosting/C2 1 TTPs
- Drops file in System32 directory 1 IoCs
- Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs
- Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs
- Suspicious use of SetThreadContext 1 IoCs
- Drops file in Program Files directory 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious behavior: MapViewOfSection 1 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 4 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\pdf.exe"C:\Users\Admin\AppData\Local\Temp\pdf.exe"1⤵
- Checks QEMU agent file
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Program Files directory
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\pdf.exe"C:\Users\Admin\AppData\Local\Temp\pdf.exe"2⤵
- Checks QEMU agent file
- Checks computer location settings
- Suspicious use of NtCreateThreadExHideFromDebugger
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
System.dll
memory/3220-143-0x0000000000400000-0x0000000001654000-memory.dmp
memory/3220-144-0x0000000001660000-0x0000000002D6D000-memory.dmp
memory/3220-157-0x0000000000400000-0x0000000001654000-memory.dmp
memory/3220-158-0x0000000000400000-0x0000000001654000-memory.dmp
memory/3220-159-0x0000000001660000-0x0000000002D6D000-memory.dmp
memory/3220-160-0x0000000001660000-0x0000000002D6D000-memory.dmp
memory/3220-161-0x00000000332A0000-0x00000000335EA000-memory.dmp
memory/3220-162-0x0000000000400000-0x0000000001654000-memory.dmp
memory/4220-141-0x0000000002AD0000-0x00000000041DD000-memory.dmp
memory/4220-142-0x0000000002AD0000-0x00000000041DD000-memory.dmp