quasar | a7213d2f57e96c1cc5e026f53eae26941ef1d64bdb3a588a96b81a3cbef92548

General

Target

Client-built.exe
Size

3.4MB
MD5

5563db885f9dff8a21515399173729af
SHA1

699f3b02b8708ff390bea58f92380610aef1a016
SHA256

a7213d2f57e96c1cc5e026f53eae26941ef1d64bdb3a588a96b81a3cbef92548
SHA512

bae11f061c5bee115792c8e429b594b8d3980208c67a2f88ea76ccbf298e26978c57f1b32b564e2585c60e9c711d043c20e11f461b887fb1c30eb2731ed9aaac
SSDEEP

98304:CvY62XlaSFNWPjljiFXRoUYIjhRJ6Dux:kQZYsC

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

gaykami.zapto.org:4782

Mutex

fd070244-4e4f-464f-bf66-b0519c62cf67

Attributes

encryption_key
D408429A8F1C644E0A5D5AD709BD41BEADE3C3F6
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 payload 4 IoCs

resource	yara_rule
behavioral1/memory/2204-0-0x0000000000A70000-0x0000000000DD6000-memory.dmp	family_quasar
behavioral1/files/0x003000000001233b-6.dat	family_quasar
behavioral1/memory/2564-10-0x00000000008D0000-0x0000000000C36000-memory.dmp	family_quasar
behavioral1/memory/1972-16-0x0000000000CB0000-0x0000000001016000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2564	Client.exe

Drops file in System32 directory 5 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-built.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client.exe
File opened for modification	C:\Windows\system32\SubDir	Client.exe

Creates scheduled task(s) 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
2508	schtasks.exe
2548	schtasks.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	2204	Client-built.exe
Token: SeDebugPrivilege	2564	Client.exe
Token: 33	3028	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	3028	AUDIODG.EXE
Token: 33	3028	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	3028	AUDIODG.EXE
Token: SeDebugPrivilege	1972	Client-built.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2564	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2564	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2564	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2204 wrote to memory of 2508	2204	Client-built.exe	28
PID 2204 wrote to memory of 2508	2204	Client-built.exe	28
PID 2204 wrote to memory of 2508	2204	Client-built.exe	28
PID 2204 wrote to memory of 2564	2204	Client-built.exe	30
PID 2204 wrote to memory of 2564	2204	Client-built.exe	30
PID 2204 wrote to memory of 2564	2204	Client-built.exe	30
PID 2564 wrote to memory of 2548	2564	Client.exe	31
PID 2564 wrote to memory of 2548	2564	Client.exe	31
PID 2564 wrote to memory of 2548	2564	Client.exe	31

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:2204
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:2508
- 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 FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2564
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2548

C:\Windows\explorer.exe
"C:\Windows\explorer.exe"
1⤵
PID:2024

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x5a4
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3028

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1972

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
3.4MB

MD5
5563db885f9dff8a21515399173729af

SHA1
699f3b02b8708ff390bea58f92380610aef1a016

SHA256
a7213d2f57e96c1cc5e026f53eae26941ef1d64bdb3a588a96b81a3cbef92548

SHA512
bae11f061c5bee115792c8e429b594b8d3980208c67a2f88ea76ccbf298e26978c57f1b32b564e2585c60e9c711d043c20e11f461b887fb1c30eb2731ed9aaac

Download Submit
memory/1972-16-0x0000000000CB0000-0x0000000001016000-memory.dmp

Filesize
3.4MB

Download
memory/2204-0-0x0000000000A70000-0x0000000000DD6000-memory.dmp

Filesize
3.4MB

Download
memory/2204-1-0x000007FEF5440000-0x000007FEF5E2C000-memory.dmp

Filesize
9.9MB

Download
memory/2204-2-0x00000000004E0000-0x0000000000560000-memory.dmp

Filesize
512KB

Download
memory/2204-9-0x000007FEF5440000-0x000007FEF5E2C000-memory.dmp

Filesize
9.9MB

Download
memory/2564-8-0x000007FEF5440000-0x000007FEF5E2C000-memory.dmp

Filesize
9.9MB

Download
memory/2564-10-0x00000000008D0000-0x0000000000C36000-memory.dmp

Filesize
3.4MB

Download
memory/2564-11-0x00000000024A0000-0x0000000002520000-memory.dmp

Filesize
512KB

Download
memory/2564-12-0x000007FEF5440000-0x000007FEF5E2C000-memory.dmp

Filesize
9.9MB

Download
memory/2564-13-0x00000000024A0000-0x0000000002520000-memory.dmp

Filesize
512KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads