quasar | d84cb257d1647aaf06f6cb154bc7bdd9e542751d3373dce4986b4a3712deed5d

General

Target

Client-built.exe
Size

3.1MB
MD5

d6edcd97a141f64fe46289bf6bbf3a8f
SHA1

8cd43e6311f3b62bfba522c25315d1e737d265e3
SHA256

d84cb257d1647aaf06f6cb154bc7bdd9e542751d3373dce4986b4a3712deed5d
SHA512

664fe3111b738f56ab36f27cd01a99386e75193b0bc9cc40782e6480a9117ed0e47f471c27b208d9a8cc5d667f8ccb14627273af87915f8953658a0744443885
SSDEEP

49152:OvVt62XlaSFNWPjljiFa2RoUYI2jSJ1JZQoGd6THHB72eh2NT:Ovn62XlaSFNWPjljiFXRoUYI2jS4

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.132:4782

Mutex

87a4bbe1-6583-48dd-943b-4f569edd0b04

Attributes

encryption_key
AA6FC0D7B31977C5D714222F90C7F94D36193E6F
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Discord
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/2080-1-0x0000000000DC0000-0x00000000010E4000-memory.dmp	family_quasar
behavioral1/files/0x00080000000173f4-5.dat	family_quasar
behavioral1/memory/2712-8-0x0000000000CE0000-0x0000000001004000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2712	Client.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client-built.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
2760	schtasks.exe
2588	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2080	Client-built.exe
Token: SeDebugPrivilege	2712	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2712	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2712	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2712	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2080 wrote to memory of 2760	2080	Client-built.exe	30
PID 2080 wrote to memory of 2760	2080	Client-built.exe	30
PID 2080 wrote to memory of 2760	2080	Client-built.exe	30
PID 2080 wrote to memory of 2712	2080	Client-built.exe	32
PID 2080 wrote to memory of 2712	2080	Client-built.exe	32
PID 2080 wrote to memory of 2712	2080	Client-built.exe	32
PID 2712 wrote to memory of 2588	2712	Client.exe	33
PID 2712 wrote to memory of 2588	2712	Client.exe	33
PID 2712 wrote to memory of 2588	2712	Client.exe	33

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⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2080
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Discord" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2760
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\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:2712
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Discord" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2588

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:\Windows\System32\SubDir\Client.exe

Filesize
3.1MB

MD5
d6edcd97a141f64fe46289bf6bbf3a8f

SHA1
8cd43e6311f3b62bfba522c25315d1e737d265e3

SHA256
d84cb257d1647aaf06f6cb154bc7bdd9e542751d3373dce4986b4a3712deed5d

SHA512
664fe3111b738f56ab36f27cd01a99386e75193b0bc9cc40782e6480a9117ed0e47f471c27b208d9a8cc5d667f8ccb14627273af87915f8953658a0744443885

Download Submit
memory/2080-0-0x000007FEF57C3000-0x000007FEF57C4000-memory.dmp

Filesize
4KB

Download
memory/2080-1-0x0000000000DC0000-0x00000000010E4000-memory.dmp

Filesize
3.1MB

Download
memory/2080-2-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

Filesize
9.9MB

Download
memory/2080-9-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

Filesize
9.9MB

Download
memory/2712-7-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

Filesize
9.9MB

Download
memory/2712-8-0x0000000000CE0000-0x0000000001004000-memory.dmp

Filesize
3.1MB

Download
memory/2712-10-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

Filesize
9.9MB

Download
memory/2712-11-0x000007FEF57C0000-0x000007FEF61AC000-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