quasar | 07d3041cc1e083636c50da63eba0582f2a3b169b26a6bc3c155e90c126c6c3a0

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240709-en
resource tags

arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
submitted
23/07/2024, 13:14

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General

Target

Client-built.exe
Size

3.1MB
MD5

39bf77938932902a452a7f79e3a392d5
SHA1

6fa01f25e1211ebefbbe9a4cccef4223cfbba1ea
SHA256

07d3041cc1e083636c50da63eba0582f2a3b169b26a6bc3c155e90c126c6c3a0
SHA512

5805d811f47ed1f423d9043a6652d0f9c52e2a9e56d156da4d24061d8ab840220a4059e094218a421f5e2b5d66234e3a83c6fe4962b5dde3b2b7a03e147ad0dd
SSDEEP

49152:uvkt62XlaSFNWPjljiFa2RoUYI9sn85BbRULoGdVzSTHHB72eh2NT:uv462XlaSFNWPjljiFXRoUYI9sn85i

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.4:4782

Mutex

7e7eefb0-bbcf-4b86-acd2-8a3675af71f2

Attributes

encryption_key
850E5D08EE2F98145C3742B9BDCCD637E6DD2097
install_name
taskhost.exe
log_directory
Logs
reconnect_delay
3000
startup_key
taskhost
subdirectory
SKR

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral1/memory/1672-1-0x0000000000910000-0x0000000000C34000-memory.dmp	family_quasar
behavioral1/files/0x0007000000023445-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1144	taskhost.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
2096	schtasks.exe
2172	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1672	Client-built.exe
Token: SeDebugPrivilege	1144	taskhost.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1144	taskhost.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
1144	taskhost.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1144	taskhost.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1672 wrote to memory of 2096	1672	Client-built.exe	85
PID 1672 wrote to memory of 2096	1672	Client-built.exe	85
PID 1672 wrote to memory of 1144	1672	Client-built.exe	88
PID 1672 wrote to memory of 1144	1672	Client-built.exe	88
PID 1144 wrote to memory of 2172	1144	taskhost.exe	92
PID 1144 wrote to memory of 2172	1144	taskhost.exe	92

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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1672
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "taskhost" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SKR\taskhost.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2096
- C:\Users\Admin\AppData\Roaming\SKR\taskhost.exe
  "C:\Users\Admin\AppData\Roaming\SKR\taskhost.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:1144
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "taskhost" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SKR\taskhost.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2172

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\SKR\taskhost.exe

Filesize
3.1MB

MD5
39bf77938932902a452a7f79e3a392d5

SHA1
6fa01f25e1211ebefbbe9a4cccef4223cfbba1ea

SHA256
07d3041cc1e083636c50da63eba0582f2a3b169b26a6bc3c155e90c126c6c3a0

SHA512
5805d811f47ed1f423d9043a6652d0f9c52e2a9e56d156da4d24061d8ab840220a4059e094218a421f5e2b5d66234e3a83c6fe4962b5dde3b2b7a03e147ad0dd

Download Submit
memory/1144-8-0x00007FFBABAD0000-0x00007FFBAC591000-memory.dmp

Filesize
10.8MB

Download
memory/1144-10-0x00007FFBABAD0000-0x00007FFBAC591000-memory.dmp

Filesize
10.8MB

Download
memory/1144-11-0x000000001C9D0000-0x000000001CA20000-memory.dmp

Filesize
320KB

Download
memory/1144-12-0x000000001CAE0000-0x000000001CB92000-memory.dmp

Filesize
712KB

Download
memory/1144-13-0x00007FFBABAD0000-0x00007FFBAC591000-memory.dmp

Filesize
10.8MB

Download
memory/1672-0-0x00007FFBABAD3000-0x00007FFBABAD5000-memory.dmp

Filesize
8KB

Download
memory/1672-1-0x0000000000910000-0x0000000000C34000-memory.dmp

Filesize
3.1MB

Download
memory/1672-2-0x00007FFBABAD0000-0x00007FFBAC591000-memory.dmp

Filesize
10.8MB

Download
memory/1672-9-0x00007FFBABAD0000-0x00007FFBAC591000-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