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 4 IoCs

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

resource	yara_rule
behavioral1/files/0x000d000000005ba9-55.dat	disable_win_def
behavioral1/files/0x000d000000005ba9-57.dat	disable_win_def
behavioral1/files/0x000d000000005ba9-58.dat	disable_win_def
behavioral1/memory/900-61-0x0000000000820000-0x00000000008AC000-memory.dmp	disable_win_def

Quasar Payload 4 IoCs

resource	yara_rule
behavioral1/files/0x000d000000005ba9-55.dat	family_quasar
behavioral1/files/0x000d000000005ba9-57.dat	family_quasar
behavioral1/files/0x000d000000005ba9-58.dat	family_quasar
behavioral1/memory/900-61-0x0000000000820000-0x00000000008AC000-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
900	$77-Venom.exe

Loads dropped DLL 1 IoCs

pid	Process
852	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
1	ip-api.com

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

System Information Discovery
T1082

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	900	$77-Venom.exe
Token: SeDebugPrivilege	900	$77-Venom.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1288	DllHost.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 852 wrote to memory of 900	852	735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe	27
PID 852 wrote to memory of 900	852	735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe	27
PID 852 wrote to memory of 900	852	735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe	27
PID 852 wrote to memory of 900	852	735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe	27

C:\Users\Admin\AppData\Local\Temp\735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe
"C:\Users\Admin\AppData\Local\Temp\735cbb15792d8be93c653fd2febafc249e57b29faa25aaafb99b42b310bca104.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:852
- 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:900

C:\Windows\SysWOW64\DllHost.exe
C:\Windows\SysWOW64\DllHost.exe /Processid:{76D0CB12-7604-4048-B83C-1005C7DDC503}
1⤵
- Suspicious use of FindShellTrayWindow
PID:1288

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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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
C:\Users\Admin\AppData\Roaming\shipoil.jpg

Filesize
30KB

MD5
7363f95e115ad5cb08d178430e46fb2b

SHA1
8d2ae220cc204de0c2f6aee25d77c99ed7003e18

SHA256
ee04486009e345f00c2c08ccea1231d57dff8213848612dc4d728d29b79ea93d

SHA512
6923284c9b813e80453486193a49fe526cdfa8013039d9b49a6f9ef706a1d615407e26b90c39f7af02ca7f387c893c476b3ef4ded0d00961d75c5b719d92ca5b

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

Filesize
534KB

MD5
2e58a2182d8a2b8160b2bddadbc362a2

SHA1
8edb5e6815452d2c46f4a0b37ec7be9381ad6727

SHA256
4db62762c3c25e877f8968c46246fa4d83cc11bec22e63019ecb3c5b4d1291cf

SHA512
5e36b421351eddb89583d6c2448524a28d76576aa95ae53809f83afd695a91a68a3213f1cd043aec9f00261e9324a32a4b4b05f1fed477a89efb62c5403e3e35

Download Submit
memory/852-54-0x0000000076781000-0x0000000076783000-memory.dmp

Filesize
8KB

Download
memory/852-59-0x0000000074A70000-0x000000007501B000-memory.dmp

Filesize
5.7MB

Download
memory/900-61-0x0000000000820000-0x00000000008AC000-memory.dmp

Filesize
560KB

Download

Analysis

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