quasar | ad1f0223d956f363ef09ac2112ed249c0057f81ff96ab9bf3d89eef466ba7695

General

Target

Client-built.exe
Size

3.1MB
MD5

9e50097d21a19941ba554a3ee1f808c7
SHA1

af332959d09f257bfb6dc0fe6783e359da2bf4cc
SHA256

ad1f0223d956f363ef09ac2112ed249c0057f81ff96ab9bf3d89eef466ba7695
SHA512

61365d695b888d468400f34afc91bef1ddf199e94214eafceef4bdda6e263d07ec07831370d2f4445e1c2a39d2fdc6efd951645dbb0eb7a56f93feb0c16b41a6
SSDEEP

49152:Kvot62XlaSFNWPjljiFa2RoUYI15IcEiOKk/tLoGdboTHHB72eh2NT:Kvk62XlaSFNWPjljiFXRoUYIvIL

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.5:139

Mutex

4a047de5-e1ae-4dca-af7e-8a42a9c851fd

Attributes

encryption_key
5B8D480293BBEEB0E867D6BE63ACD141EC9C469F
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Client Startup
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/1936-1-0x0000000001200000-0x0000000001524000-memory.dmp	family_quasar
behavioral1/files/0x0008000000016c58-6.dat	family_quasar
behavioral1/memory/2568-8-0x0000000000D60000-0x0000000001084000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2568	Client.exe

Drops file in System32 directory 3 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
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client.exe

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
1680	schtasks.exe
2480	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1936	Client-built.exe
Token: SeDebugPrivilege	2568	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2568	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1936 wrote to memory of 1680	1936	Client-built.exe	30
PID 1936 wrote to memory of 1680	1936	Client-built.exe	30
PID 1936 wrote to memory of 1680	1936	Client-built.exe	30
PID 1936 wrote to memory of 2568	1936	Client-built.exe	32
PID 1936 wrote to memory of 2568	1936	Client-built.exe	32
PID 1936 wrote to memory of 2568	1936	Client-built.exe	32
PID 2568 wrote to memory of 2480	2568	Client.exe	33
PID 2568 wrote to memory of 2480	2568	Client.exe	33
PID 2568 wrote to memory of 2480	2568	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:1936
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1680
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2568
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2480

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\System32\SubDir\Client.exe

Filesize
3.1MB

MD5
9e50097d21a19941ba554a3ee1f808c7

SHA1
af332959d09f257bfb6dc0fe6783e359da2bf4cc

SHA256
ad1f0223d956f363ef09ac2112ed249c0057f81ff96ab9bf3d89eef466ba7695

SHA512
61365d695b888d468400f34afc91bef1ddf199e94214eafceef4bdda6e263d07ec07831370d2f4445e1c2a39d2fdc6efd951645dbb0eb7a56f93feb0c16b41a6

Download Submit
memory/1936-0-0x000007FEF5B43000-0x000007FEF5B44000-memory.dmp

Filesize
4KB

Download
memory/1936-1-0x0000000001200000-0x0000000001524000-memory.dmp

Filesize
3.1MB

Download
memory/1936-2-0x000007FEF5B40000-0x000007FEF652C000-memory.dmp

Filesize
9.9MB

Download
memory/1936-9-0x000007FEF5B40000-0x000007FEF652C000-memory.dmp

Filesize
9.9MB

Download
memory/2568-10-0x000007FEF5B40000-0x000007FEF652C000-memory.dmp

Filesize
9.9MB

Download
memory/2568-8-0x0000000000D60000-0x0000000001084000-memory.dmp

Filesize
3.1MB

Download
memory/2568-11-0x000007FEF5B40000-0x000007FEF652C000-memory.dmp

Filesize
9.9MB

Download
memory/2568-12-0x000007FEF5B40000-0x000007FEF652C000-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