quasar | 370a1ac54255d09c5870186a4156f6f58894876c66f1b249a082d3cb91f482af

General

Target

Solara-Download-main/Build-Client.exe
Size

3.1MB
MD5

c34d921ff3487c05cfff4991df196535
SHA1

c9c7ae70b2020a3f80996a1399b6eb160cfbf72c
SHA256

2bcc519da18324c5cfde4f0e7a2e6fa3d7e8b2c3c020ced81f07460f77476ed3
SHA512

35f51730586e8107a87aadf9bb902282285aabb2ef9ebd0e119d76e56a80f7608eb6bc799392a7c99cfd1e83e9d9626780b9b0bbc170888a4de43fd1cb360f88
SSDEEP

49152:SvzlL26AaNeWgPhlmVqvMQ7XSK9gRJ6/bR3LoGd3kTHHB72eh2NT:SvpL26AaNeWgPhlmVqkQ7XSK9gRJ6R

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.0.113:4782

Mutex

c82ea6b0-d255-45fb-b0eb-547ab14c0e9e

Attributes

encryption_key
045BFCAC42C40445C0D8EBEF569DD1BF4BB62A56
install_name
Build-client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar 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

Processes:

resource	yara_rule
behavioral3/memory/2692-1-0x0000000000E90000-0x00000000011B4000-memory.dmp	family_quasar
behavioral3/files/0x0007000000015d70-6.dat	family_quasar
behavioral3/memory/3024-10-0x0000000000A80000-0x0000000000DA4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Build-client.exe

pid	Process
3024	Build-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

Processes:

schtasks.exeschtasks.exe

pid	Process
2696	schtasks.exe
2108	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Build-Client.exeBuild-client.exe

description	pid	Process
Token: SeDebugPrivilege	2692	Build-Client.exe
Token: SeDebugPrivilege	3024	Build-client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Build-client.exe

pid	Process
3024	Build-client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Build-Client.exeBuild-client.exe

description	pid	Process	procid_target
PID 2692 wrote to memory of 2696	2692	Build-Client.exe	31
PID 2692 wrote to memory of 2696	2692	Build-Client.exe	31
PID 2692 wrote to memory of 2696	2692	Build-Client.exe	31
PID 2692 wrote to memory of 3024	2692	Build-Client.exe	33
PID 2692 wrote to memory of 3024	2692	Build-Client.exe	33
PID 2692 wrote to memory of 3024	2692	Build-Client.exe	33
PID 3024 wrote to memory of 2108	3024	Build-client.exe	34
PID 3024 wrote to memory of 2108	3024	Build-client.exe	34
PID 3024 wrote to memory of 2108	3024	Build-client.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\Solara-Download-main\Build-Client.exe
"C:\Users\Admin\AppData\Local\Temp\Solara-Download-main\Build-Client.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2692
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Build-client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2696
- C:\Users\Admin\AppData\Roaming\SubDir\Build-client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Build-client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3024
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Build-client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2108

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:\Users\Admin\AppData\Roaming\SubDir\Build-client.exe

Filesize
3.1MB

MD5
c34d921ff3487c05cfff4991df196535

SHA1
c9c7ae70b2020a3f80996a1399b6eb160cfbf72c

SHA256
2bcc519da18324c5cfde4f0e7a2e6fa3d7e8b2c3c020ced81f07460f77476ed3

SHA512
35f51730586e8107a87aadf9bb902282285aabb2ef9ebd0e119d76e56a80f7608eb6bc799392a7c99cfd1e83e9d9626780b9b0bbc170888a4de43fd1cb360f88

Download Submit
memory/2692-0-0x000007FEF61F3000-0x000007FEF61F4000-memory.dmp

Filesize
4KB

Download
memory/2692-1-0x0000000000E90000-0x00000000011B4000-memory.dmp

Filesize
3.1MB

Download
memory/2692-2-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

Filesize
9.9MB

Download
memory/2692-8-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

Filesize
9.9MB

Download
memory/3024-9-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

Filesize
9.9MB

Download
memory/3024-10-0x0000000000A80000-0x0000000000DA4000-memory.dmp

Filesize
3.1MB

Download
memory/3024-11-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

Filesize
9.9MB

Download
memory/3024-12-0x000007FEF61F0000-0x000007FEF6BDC000-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