91cd8bfbe714acc43beff32856c3d56ded48706d3c92c492a1acb994b606003b

Analysis

max time kernel
1810s
max time network
1818s
platform
windows7_x64
resource
win7-en-20211208
submitted
16-02-2022 17:24

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General

Target

all/gcs/crypt.exe
Size

9.9MB
MD5

b9e93f1bce9f61e1a98083a36c8a4a06
SHA1

9b4d9b385d47831749059a7db02008bbdf610146
SHA256

476be5bcce19adbc987d6e99b2edd2c55599fb9367ae72a8a175284cf07c6802
SHA512

6f97821eeded7dd9c160358b440b73c1d26b656a77b5c08f33b1550d23ea5cbfddb048093dac5333e32ab6bfa87e8e7d6d4dca1d0846ea337c4b6b40b31fb206

Score

9^/10

evasion themida trojan

Malware Config

Signatures

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

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

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

Processes:

crypt.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	crypt.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	crypt.exe

Themida packer 1 IoCs

Detects Themida, an advanced Windows software protection system.

themida

Processes:

resource	yara_rule
behavioral21/memory/1872-55-0x000000013FA40000-0x00000001413EC000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs
evasion trojan

System Information Discovery
T1082

Processes:

crypt.exe

description ioc process

Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA crypt.exe
Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

Processes:

crypt.exe

pid process

1872 crypt.exe

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

pid	process
1872	crypt.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

crypt.exe

description	pid	process	target process
PID 1872 wrote to memory of 848	1872	crypt.exe	cmd.exe
PID 1872 wrote to memory of 848	1872	crypt.exe	cmd.exe
PID 1872 wrote to memory of 848	1872	crypt.exe	cmd.exe

C:\Users\Admin\AppData\Local\Temp\all\gcs\crypt.exe
"C:\Users\Admin\AppData\Local\Temp\all\gcs\crypt.exe"
1⤵
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of WriteProcessMemory
PID:1872
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c pause
  2⤵
  PID:848

Network

MITRE ATT&CK Enterprise v6

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/1872-54-0x000000013FA41000-0x000000013FA44000-memory.dmp

Filesize
12KB

Download
memory/1872-56-0x00000000775E0000-0x00000000775E2000-memory.dmp

Filesize
8KB

Download
memory/1872-55-0x000000013FA40000-0x00000001413EC000-memory.dmp

Filesize
25.7MB

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