quasar | 7b718d668fa3aed991ee8b9fc8f76fed543e5045f411369df659ee4cf09a0413

General

Target

Clientv2.exe
Size

3.2MB
MD5

f312e5b89c544d808859a09fbf8e6e9a
SHA1

917b95dc9c0f5ca7f089ad645c99395419914f37
SHA256

7b718d668fa3aed991ee8b9fc8f76fed543e5045f411369df659ee4cf09a0413
SHA512

2f894bb5f89e403fd22c2b2437043b8e79092f4d019a10fe13db3b89689374c6379af7372723bd343095b1b036b773d8ee3e1b95b955a452c46e0dac74c51b5b
SSDEEP

49152:wvdt62XlaSFNWPjljiFa2RoUYIzlRJ6MbR3LoGdkTHHB72eh2NT:wvf62XlaSFNWPjljiFXRoUYIzlRJ6W

Score

10^/10

quasar quasarv2 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Quasarv2

C2

178.83.80.11:4782

Mutex

01be4b22-353e-48a7-a4fc-41ed4d3b5081

Attributes

encryption_key
B729697B6EECAC23F05DCF0A1F0857B793DF22A5
install_name
WinStart.exe
log_directory
TempLogs
reconnect_delay
3000
startup_key
WinStart
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 2 IoCs

resource	yara_rule
behavioral1/memory/2652-1-0x00000000009C0000-0x0000000000CF4000-memory.dmp	family_quasar
behavioral1/files/0x0008000000024248-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3456	WinStart.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
5096	schtasks.exe
4748	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
4756	powershell.exe
4756	powershell.exe
4756	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2652	Clientv2.exe
Token: SeDebugPrivilege	3456	WinStart.exe
Token: SeDebugPrivilege	4756	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3456	WinStart.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2652 wrote to memory of 5096	2652	Clientv2.exe	90
PID 2652 wrote to memory of 5096	2652	Clientv2.exe	90
PID 2652 wrote to memory of 3456	2652	Clientv2.exe	92
PID 2652 wrote to memory of 3456	2652	Clientv2.exe	92
PID 3456 wrote to memory of 4748	3456	WinStart.exe	93
PID 3456 wrote to memory of 4748	3456	WinStart.exe	93

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Clientv2.exe
"C:\Users\Admin\AppData\Local\Temp\Clientv2.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2652
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "WinStart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\WinStart.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:5096
- C:\Users\Admin\AppData\Roaming\SubDir\WinStart.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\WinStart.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3456
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "WinStart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\WinStart.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4748

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4756

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_dqre11pn.bze.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\WinStart.exe

Filesize
3.2MB

MD5
f312e5b89c544d808859a09fbf8e6e9a

SHA1
917b95dc9c0f5ca7f089ad645c99395419914f37

SHA256
7b718d668fa3aed991ee8b9fc8f76fed543e5045f411369df659ee4cf09a0413

SHA512
2f894bb5f89e403fd22c2b2437043b8e79092f4d019a10fe13db3b89689374c6379af7372723bd343095b1b036b773d8ee3e1b95b955a452c46e0dac74c51b5b

Download Submit
memory/2652-0-0x00007FFEBD493000-0x00007FFEBD495000-memory.dmp

Filesize
8KB

Download
memory/2652-1-0x00000000009C0000-0x0000000000CF4000-memory.dmp

Filesize
3.2MB

Download
memory/2652-2-0x00007FFEBD490000-0x00007FFEBDF51000-memory.dmp

Filesize
10.8MB

Download
memory/2652-9-0x00007FFEBD490000-0x00007FFEBDF51000-memory.dmp

Filesize
10.8MB

Download
memory/3456-13-0x000000001C2C0000-0x000000001C372000-memory.dmp

Filesize
712KB

Download
memory/3456-12-0x000000001B930000-0x000000001B980000-memory.dmp

Filesize
320KB

Download
memory/3456-11-0x00007FFEBD490000-0x00007FFEBDF51000-memory.dmp

Filesize
10.8MB

Download
memory/3456-16-0x000000001C200000-0x000000001C212000-memory.dmp

Filesize
72KB

Download
memory/3456-17-0x000000001C260000-0x000000001C29C000-memory.dmp

Filesize
240KB

Download
memory/3456-18-0x00007FFEBD490000-0x00007FFEBDF51000-memory.dmp

Filesize
10.8MB

Download
memory/3456-19-0x000000001D1F0000-0x000000001D718000-memory.dmp

Filesize
5.2MB

Download
memory/3456-10-0x00007FFEBD490000-0x00007FFEBDF51000-memory.dmp

Filesize
10.8MB

Download
memory/4756-22-0x000001DFD13E0000-0x000001DFD1402000-memory.dmp

Filesize
136KB

Download
memory/4756-32-0x000001DFD18A0000-0x000001DFD18E4000-memory.dmp

Filesize
272KB

Download
memory/4756-33-0x000001DFD1970000-0x000001DFD19E6000-memory.dmp

Filesize
472KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads