86a04af65a919f8da80e3e70ddc5ffe4fc08dcdc6c6f4669133dd3e54968992a

Analysis

max time kernel
117s
max time network
118s
platform
windows7_x64
resource
win7-20240220-en
resource tags

arch:x64arch:x86image:win7-20240220-enlocale:en-usos:windows7-x64system
submitted
23/02/2024, 14:33

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General

Target

CShell.dll
Size

4.0MB
MD5

2cb425cb5cf0a2d1f0d74bc1437e3cdb
SHA1

e9e8594788058d204d4014f781d8262dc9a79971
SHA256

c050a812f9e5d0d42fde7cc2d7996c634c0496d726a4cd4edf372d5d5610244d
SHA512

fc668c0d1a1428b76d2578c25eb062c5a0eeb44f27065d6f595a468c5c855ca8a4474ca1d5ca0226acea3090df8d402ef31d9604f06d692ef944af98ee06f095
SSDEEP

98304:y9n1MEszUnUruxXm8lDNMZXK3wBUu59xhGcK:pTUUr0mvMbu5PhG

Score

9^/10

evasion

Malware Config

Signatures

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	rundll32.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	rundll32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	rundll32.exe

Identifies Wine through registry keys 2 TTPs 1 IoCs

Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Wine	rundll32.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
2204	rundll32.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2204	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 1684 wrote to memory of 2204	1684	rundll32.exe	28
PID 1684 wrote to memory of 2204	1684	rundll32.exe	28
PID 1684 wrote to memory of 2204	1684	rundll32.exe	28
PID 1684 wrote to memory of 2204	1684	rundll32.exe	28
PID 1684 wrote to memory of 2204	1684	rundll32.exe	28
PID 1684 wrote to memory of 2204	1684	rundll32.exe	28
PID 1684 wrote to memory of 2204	1684	rundll32.exe	28

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\CShell.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1684
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\CShell.dll,#1
  2⤵
  - Identifies VirtualBox via ACPI registry values (likely anti-VM)
  - Checks BIOS information in registry
  - Identifies Wine through registry keys
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious behavior: EnumeratesProcesses
  PID:2204

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2204-0-0x0000000010000000-0x000000001159A000-memory.dmp

Filesize
21.6MB

Download
memory/2204-1-0x0000000010000000-0x000000001159A000-memory.dmp

Filesize
21.6MB

Download
memory/2204-2-0x0000000010000000-0x000000001159A000-memory.dmp

Filesize
21.6MB

Download
memory/2204-3-0x0000000010000000-0x000000001159A000-memory.dmp

Filesize
21.6MB

Download
memory/2204-4-0x0000000077D80000-0x0000000077D82000-memory.dmp

Filesize
8KB

Download