quasar | a45b373b780f5b9fcf5c51473c69bbf0ed650f300523097602b35f5222bd122b

General

Target

a45b373b780f5b9fcf5c51473c69bbf0ed650f300523097602b35f5222bd122b.exe
Size

3.1MB
MD5

94222631ef1071a4f7ceb180cf8a4a5a
SHA1

786d8b2d8b931a9282ee54367d2dda501f1ca946
SHA256

a45b373b780f5b9fcf5c51473c69bbf0ed650f300523097602b35f5222bd122b
SHA512

00503983a35e8d0f65eea6a811d7177a389cb1b4d8716d32e50fd5346deb428cd472cbaca7375c56ac3f113ea76db55322993b4d68d816b50a4b27887a2fa14d
SSDEEP

49152:ivht62XlaSFNWPjljiFa2RoUYIo7RJ6SbR3LoGd+vTHHB72eh2NT:ivL62XlaSFNWPjljiFXRoUYIo7RJ6M

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

91.92.243.191:5401

Mutex

fce41024-0e2f-475b-929b-e58a126341bd

Attributes

encryption_key
802CAE367B042C840DD4E29539BB1BFEC16FB48A
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
vchost32
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
behavioral2/memory/208-1-0x0000000000440000-0x0000000000764000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b78-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3520	Client.exe

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

System Information Discovery
T1082

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
3620	schtasks.exe
4048	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	208	a45b373b780f5b9fcf5c51473c69bbf0ed650f300523097602b35f5222bd122b.exe
Token: SeDebugPrivilege	3520	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3520	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3520	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3520	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 208 wrote to memory of 3620	208	a45b373b780f5b9fcf5c51473c69bbf0ed650f300523097602b35f5222bd122b.exe	83
PID 208 wrote to memory of 3620	208	a45b373b780f5b9fcf5c51473c69bbf0ed650f300523097602b35f5222bd122b.exe	83
PID 208 wrote to memory of 3520	208	a45b373b780f5b9fcf5c51473c69bbf0ed650f300523097602b35f5222bd122b.exe	85
PID 208 wrote to memory of 3520	208	a45b373b780f5b9fcf5c51473c69bbf0ed650f300523097602b35f5222bd122b.exe	85
PID 3520 wrote to memory of 4048	3520	Client.exe	86
PID 3520 wrote to memory of 4048	3520	Client.exe	86

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\a45b373b780f5b9fcf5c51473c69bbf0ed650f300523097602b35f5222bd122b.exe
"C:\Users\Admin\AppData\Local\Temp\a45b373b780f5b9fcf5c51473c69bbf0ed650f300523097602b35f5222bd122b.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:208
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "vchost32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3620
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3520
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "vchost32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4048

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

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
94222631ef1071a4f7ceb180cf8a4a5a

SHA1
786d8b2d8b931a9282ee54367d2dda501f1ca946

SHA256
a45b373b780f5b9fcf5c51473c69bbf0ed650f300523097602b35f5222bd122b

SHA512
00503983a35e8d0f65eea6a811d7177a389cb1b4d8716d32e50fd5346deb428cd472cbaca7375c56ac3f113ea76db55322993b4d68d816b50a4b27887a2fa14d

Download Submit
memory/208-0-0x00007FFE00F33000-0x00007FFE00F35000-memory.dmp

Filesize
8KB

Download
memory/208-1-0x0000000000440000-0x0000000000764000-memory.dmp

Filesize
3.1MB

Download
memory/208-2-0x00007FFE00F30000-0x00007FFE019F1000-memory.dmp

Filesize
10.8MB

Download
memory/208-9-0x00007FFE00F30000-0x00007FFE019F1000-memory.dmp

Filesize
10.8MB

Download
memory/3520-10-0x00007FFE00F30000-0x00007FFE019F1000-memory.dmp

Filesize
10.8MB

Download
memory/3520-11-0x00007FFE00F30000-0x00007FFE019F1000-memory.dmp

Filesize
10.8MB

Download
memory/3520-12-0x000000001C340000-0x000000001C390000-memory.dmp

Filesize
320KB

Download
memory/3520-13-0x000000001C450000-0x000000001C502000-memory.dmp

Filesize
712KB

Download
memory/3520-14-0x00007FFE00F30000-0x00007FFE019F1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads