quasar | 735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104

General

Target

735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe
Size

485KB
MD5

320c9b7f61e1a20f89d2b4514d1545f0
SHA1

36d91c66517c404317ddf5b596c4e5f841005c9c
SHA256

735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104
SHA512

65d6d236b510f9cf0273b822c3cdad76afcdc5cb0f4c6dc9a2502eb5ea68238810dbe4c8ec332e36270984d77a1c1a7fe2c444c361f725f8a32ce040f990c276

Score

10^/10

quasar venomrat office04 rat rootkit spyware stealer suricata trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Office04

C2

myconect.ddns.net:6606

Mutex

VNM_MUTEX_8vaggmzqQMqTBMXSZ7

Attributes

encryption_key
qRvtw4YHx2BDHavO4SeK
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Venom Client Startup
subdirectory
SubDir

Signatures

Contains code to disable Windows Defender 3 IoCs

A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

resource	yara_rule
behavioral2/files/0x00060000000231e0-132.dat	disable_win_def
behavioral2/files/0x00060000000231e0-133.dat	disable_win_def
behavioral2/memory/1668-135-0x00000000005D0000-0x000000000065C000-memory.dmp	disable_win_def

Quasar Payload 3 IoCs

resource	yara_rule
behavioral2/files/0x00060000000231e0-132.dat	family_quasar
behavioral2/files/0x00060000000231e0-133.dat	family_quasar
behavioral2/memory/1668-135-0x00000000005D0000-0x000000000065C000-memory.dmp	family_quasar

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
VenomRAT
VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.
rat rootkit stealer venomrat
suricata: ET MALWARE Common RAT Connectivity Check Observed
suricata: ET MALWARE Common RAT Connectivity Check Observed
suricata

Executes dropped EXE 1 IoCs

pid	Process
1668	$77-Venom.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Control Panel\International\Geo\Nation	735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe

Drops desktop.ini file(s) 2 IoCs

description	ioc	Process
File created	C:\Windows\assembly\Desktop.ini	735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe
File opened for modification	C:\Windows\assembly\Desktop.ini	735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
6	ip-api.com

Drops file in Windows directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\assembly	735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe
File created	C:\Windows\assembly\Desktop.ini	735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe
File opened for modification	C:\Windows\assembly\Desktop.ini	735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 3 IoCs

Processor 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\CentralProcessor\0\~MHz	dw20.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	dw20.exe
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	dw20.exe

Enumerates system info in registry 2 TTPs 2 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	dw20.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	dw20.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeRestorePrivilege	4352	dw20.exe
Token: SeBackupPrivilege	4352	dw20.exe
Token: SeBackupPrivilege	4352	dw20.exe
Token: SeBackupPrivilege	4352	dw20.exe
Token: SeDebugPrivilege	1668	$77-Venom.exe
Token: SeDebugPrivilege	1668	$77-Venom.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2272 wrote to memory of 1668	2272	735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe	82
PID 2272 wrote to memory of 1668	2272	735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe	82
PID 2272 wrote to memory of 1668	2272	735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe	82
PID 2272 wrote to memory of 4352	2272	735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe	83
PID 2272 wrote to memory of 4352	2272	735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe	83
PID 2272 wrote to memory of 4352	2272	735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe	83

C:\Users\Admin\AppData\Local\Temp\735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe
"C:\Users\Admin\AppData\Local\Temp\735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe"
1⤵
- Checks computer location settings
- Drops desktop.ini file(s)
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:2272
- C:\Users\Admin\AppData\Roaming\$77-Venom.exe
  "C:\Users\Admin\AppData\Roaming\$77-Venom.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1668
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\dw20.exe
  dw20.exe -x -s 1168
  2⤵
  - Checks processor information in registry
  - Enumerates system info in registry
  - Suspicious use of AdjustPrivilegeToken
  PID:4352

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

3

T1012

System Information Discovery

4

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\$77-Venom.exe

Filesize
534KB

MD5
2e58a2182d8a2b8160b2bddadbc362a2

SHA1
8edb5e6815452d2c46f4a0b37ec7be9381ad6727

SHA256
4db62762c3c25e877f8968c46246fa4d83cc11bec22e63019ecb3c5b4d1291cf

SHA512
5e36b421351eddb89583d6c2448524a28d76576aa95ae53809f83afd695a91a68a3213f1cd043aec9f00261e9324a32a4b4b05f1fed477a89efb62c5403e3e35

Download Submit
C:\Users\Admin\AppData\Roaming\$77-Venom.exe

Filesize
534KB

MD5
2e58a2182d8a2b8160b2bddadbc362a2

SHA1
8edb5e6815452d2c46f4a0b37ec7be9381ad6727

SHA256
4db62762c3c25e877f8968c46246fa4d83cc11bec22e63019ecb3c5b4d1291cf

SHA512
5e36b421351eddb89583d6c2448524a28d76576aa95ae53809f83afd695a91a68a3213f1cd043aec9f00261e9324a32a4b4b05f1fed477a89efb62c5403e3e35

Download Submit
memory/1668-135-0x00000000005D0000-0x000000000065C000-memory.dmp

Filesize
560KB

Download
memory/1668-136-0x0000000005380000-0x0000000005924000-memory.dmp

Filesize
5.6MB

Download
memory/1668-137-0x0000000004EF0000-0x0000000004F82000-memory.dmp

Filesize
584KB

Download
memory/1668-138-0x00000000050D0000-0x0000000005136000-memory.dmp

Filesize
408KB

Download
memory/1668-139-0x0000000005CF0000-0x0000000005D02000-memory.dmp

Filesize
72KB

Download
memory/1668-140-0x0000000006120000-0x000000000615C000-memory.dmp

Filesize
240KB

Download
memory/1668-141-0x00000000062E0000-0x00000000062EA000-memory.dmp

Filesize
40KB

Download
memory/2272-130-0x0000000074BC0000-0x0000000075171000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads