quasar | 7a5072dd54d7a2c09f9158e5686db032e0524e251cac95e592a5d3b27a41f49c

General

Target

Client-built.exe
Size

3.1MB
MD5

8647ed646c772ebe15351e640ebe72b6
SHA1

ac263e08bc25bbc014a583f456c3dac3edd7e587
SHA256

7a5072dd54d7a2c09f9158e5686db032e0524e251cac95e592a5d3b27a41f49c
SHA512

4ce889817a3869bbdae3603ccba86d958b883ef309188bac56548f028459df2d2c50175597156065cf94fe0c99dfa63ebcdb68000bc1c95b526b1e0eedb6fec2
SSDEEP

49152:Gvht62XlaSFNWPjljiFa2RoUYIMCZ1JwLoGdKo3THHB72eh2NT:GvL62XlaSFNWPjljiFXRoUYIMCQB

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

10.10.128.9:4782

Mutex

7a8b118d-eb46-45e9-9f01-2fe160e6067b

Attributes

encryption_key
AEF7A53D672D2BDA4424CF552DD853E2C78FE173
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
WindowsUpdater
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2964-1-0x0000000000B80000-0x0000000000EA4000-memory.dmp	family_quasar
behavioral1/files/0x001b00000002aac1-6.dat	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid	Process
416	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

Processes:

schtasks.exeschtasks.exe

pid	Process
4236	schtasks.exe
2476	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	2964	Client-built.exe
Token: SeDebugPrivilege	416	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid	Process
416	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid	Process
416	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid	Process
416	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-built.exeClient.exe

description	pid	Process	procid_target
PID 2964 wrote to memory of 4236	2964	Client-built.exe	77
PID 2964 wrote to memory of 4236	2964	Client-built.exe	77
PID 2964 wrote to memory of 416	2964	Client-built.exe	79
PID 2964 wrote to memory of 416	2964	Client-built.exe	79
PID 416 wrote to memory of 2476	416	Client.exe	80
PID 416 wrote to memory of 2476	416	Client.exe	80

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:2964
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "WindowsUpdater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4236
- 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:416
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "WindowsUpdater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2476

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
8647ed646c772ebe15351e640ebe72b6

SHA1
ac263e08bc25bbc014a583f456c3dac3edd7e587

SHA256
7a5072dd54d7a2c09f9158e5686db032e0524e251cac95e592a5d3b27a41f49c

SHA512
4ce889817a3869bbdae3603ccba86d958b883ef309188bac56548f028459df2d2c50175597156065cf94fe0c99dfa63ebcdb68000bc1c95b526b1e0eedb6fec2

Download Submit
memory/416-10-0x00007FFFCDB50000-0x00007FFFCE612000-memory.dmp

Filesize
10.8MB

Download
memory/416-11-0x00007FFFCDB50000-0x00007FFFCE612000-memory.dmp

Filesize
10.8MB

Download
memory/416-12-0x000000001C330000-0x000000001C380000-memory.dmp

Filesize
320KB

Download
memory/416-13-0x000000001C440000-0x000000001C4F2000-memory.dmp

Filesize
712KB

Download
memory/416-14-0x00007FFFCDB50000-0x00007FFFCE612000-memory.dmp

Filesize
10.8MB

Download
memory/416-15-0x00007FFFCDB50000-0x00007FFFCE612000-memory.dmp

Filesize
10.8MB

Download
memory/2964-0-0x00007FFFCDB53000-0x00007FFFCDB55000-memory.dmp

Filesize
8KB

Download
memory/2964-1-0x0000000000B80000-0x0000000000EA4000-memory.dmp

Filesize
3.1MB

Download
memory/2964-2-0x00007FFFCDB50000-0x00007FFFCE612000-memory.dmp

Filesize
10.8MB

Download
memory/2964-9-0x00007FFFCDB50000-0x00007FFFCE612000-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