quasar | 6470715a18148c46c345978216785766d8fa1548d3378dda685146d6e5cd6c7f

General

Target

Client-built.exe
Size

3.1MB
MD5

9ff508735b3785e3697ad97896820845
SHA1

01c2d68abbac2caefc163d389f43ec53798952cb
SHA256

6470715a18148c46c345978216785766d8fa1548d3378dda685146d6e5cd6c7f
SHA512

cf9ae7a63f1988c614d75b71da7244d3ea046120868dec2f6d85debd1d454a55531294da3cd02fb7e2fb02cca7f4457f819c06f9600dcc9940b11f45ea5c427b
SSDEEP

49152:2vht62XlaSFNWPjljiFa2RoUYITrgCjhdGoGddTHHB72eh2NT:2vL62XlaSFNWPjljiFXRoUYITrgP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.82:4782

Mutex

3783d7ca-3a06-404f-a250-4e9a22f8ac32

Attributes

encryption_key
47D9E81F01D52C405867EC357C00214579A008BB
install_name
sysupdate32.exe
log_directory
Logs
reconnect_delay
3000
startup_key
sysupdate32
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral1/memory/2536-1-0x0000000000AF0000-0x0000000000E14000-memory.dmp	family_quasar
behavioral1/files/0x00090000000165c7-5.dat	family_quasar
behavioral1/memory/2000-8-0x00000000013A0000-0x00000000016C4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2000	sysupdate32.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
2056	schtasks.exe
2820	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2536	Client-built.exe
Token: SeDebugPrivilege	2000	sysupdate32.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2000	sysupdate32.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2000	sysupdate32.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2536 wrote to memory of 2056	2536	Client-built.exe	30
PID 2536 wrote to memory of 2056	2536	Client-built.exe	30
PID 2536 wrote to memory of 2056	2536	Client-built.exe	30
PID 2536 wrote to memory of 2000	2536	Client-built.exe	32
PID 2536 wrote to memory of 2000	2536	Client-built.exe	32
PID 2536 wrote to memory of 2000	2536	Client-built.exe	32
PID 2000 wrote to memory of 2820	2000	sysupdate32.exe	34
PID 2000 wrote to memory of 2820	2000	sysupdate32.exe	34
PID 2000 wrote to memory of 2820	2000	sysupdate32.exe	34

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:2536
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "sysupdate32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\sysupdate32.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2056
- C:\Users\Admin\AppData\Roaming\SubDir\sysupdate32.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\sysupdate32.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:2000
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "sysupdate32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\sysupdate32.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2820

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\sysupdate32.exe

Filesize
3.1MB

MD5
9ff508735b3785e3697ad97896820845

SHA1
01c2d68abbac2caefc163d389f43ec53798952cb

SHA256
6470715a18148c46c345978216785766d8fa1548d3378dda685146d6e5cd6c7f

SHA512
cf9ae7a63f1988c614d75b71da7244d3ea046120868dec2f6d85debd1d454a55531294da3cd02fb7e2fb02cca7f4457f819c06f9600dcc9940b11f45ea5c427b

Download Submit
memory/2000-7-0x000007FEF56B0000-0x000007FEF609C000-memory.dmp

Filesize
9.9MB

Download
memory/2000-8-0x00000000013A0000-0x00000000016C4000-memory.dmp

Filesize
3.1MB

Download
memory/2000-10-0x000007FEF56B0000-0x000007FEF609C000-memory.dmp

Filesize
9.9MB

Download
memory/2000-11-0x000007FEF56B0000-0x000007FEF609C000-memory.dmp

Filesize
9.9MB

Download
memory/2536-0-0x000007FEF56B3000-0x000007FEF56B4000-memory.dmp

Filesize
4KB

Download
memory/2536-1-0x0000000000AF0000-0x0000000000E14000-memory.dmp

Filesize
3.1MB

Download
memory/2536-2-0x000007FEF56B0000-0x000007FEF609C000-memory.dmp

Filesize
9.9MB

Download
memory/2536-9-0x000007FEF56B0000-0x000007FEF609C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads