a0e1885fb81525a9722128e36fe3bcaceddbff18f6e2f6ea253958c720372eec

Analysis

max time kernel
140s
max time network
124s
platform
windows7_x64
resource
win7-20240708-en
resource tags

arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
submitted
20-08-2024 20:49

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General

Target

net6.0-windows/lib/VirtualApi.dll
Size

4.1MB
MD5

e3710cbc198551fa6800800820202d5b
SHA1

1fa4486948651eb09b1193f6f66ed8fdb8a9876a
SHA256

730c9a8aca3c2057b2462f0255838b78994527abf78e0e186d211ed00e497df3
SHA512

4e55d15f0c0fafb6075409de9573099e4d39e38e6c9f70ef2a8f25dcf1218fd6ce4ef6908e513dc11cfa9946c2119e3e03f9f7b4a7a8ac32f3759222e903db3a
SSDEEP

98304:huf3xhg2rqe4J3Qbc8g7nj/kPMSFoua5AB34Sr:M9TLNg7njWFoua6340

Score

9^/10

evasion themida trojan

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

Blocklisted process makes network request 1 IoCs

flow	pid	Process
4	2468	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

Themida packer 7 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral17/memory/2468-1-0x0000000180000000-0x0000000180ACD000-memory.dmp	themida
behavioral17/memory/2468-2-0x0000000180000000-0x0000000180ACD000-memory.dmp	themida
behavioral17/memory/2468-3-0x0000000180000000-0x0000000180ACD000-memory.dmp	themida
behavioral17/memory/2468-5-0x0000000180000000-0x0000000180ACD000-memory.dmp	themida
behavioral17/memory/2468-7-0x0000000180000000-0x0000000180ACD000-memory.dmp	themida
behavioral17/memory/2468-6-0x0000000180000000-0x0000000180ACD000-memory.dmp	themida
behavioral17/memory/2468-8-0x0000000180000000-0x0000000180ACD000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	rundll32.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
3	raw.githubusercontent.com
4	raw.githubusercontent.com

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
2468	rundll32.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2468	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2468 wrote to memory of 2760	2468	rundll32.exe	31
PID 2468 wrote to memory of 2760	2468	rundll32.exe	31
PID 2468 wrote to memory of 2760	2468	rundll32.exe	31

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\net6.0-windows\lib\VirtualApi.dll,#1
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Blocklisted process makes network request
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2468
- C:\Windows\system32\WerFault.exe
  C:\Windows\system32\WerFault.exe -u -p 2468 -s 92
  2⤵
  PID:2760

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

Web Service

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2468-0-0x0000000180000000-0x0000000180ACD000-memory.dmp

Filesize
10.8MB

Download
memory/2468-1-0x0000000180000000-0x0000000180ACD000-memory.dmp

Filesize
10.8MB

Download
memory/2468-2-0x0000000180000000-0x0000000180ACD000-memory.dmp

Filesize
10.8MB

Download
memory/2468-4-0x0000000077AA0000-0x0000000077AA2000-memory.dmp

Filesize
8KB

Download
memory/2468-3-0x0000000180000000-0x0000000180ACD000-memory.dmp

Filesize
10.8MB

Download
memory/2468-5-0x0000000180000000-0x0000000180ACD000-memory.dmp

Filesize
10.8MB

Download
memory/2468-7-0x0000000180000000-0x0000000180ACD000-memory.dmp

Filesize
10.8MB

Download
memory/2468-6-0x0000000180000000-0x0000000180ACD000-memory.dmp

Filesize
10.8MB

Download
memory/2468-8-0x0000000180000000-0x0000000180ACD000-memory.dmp

Filesize
10.8MB

Download