quasar | 254cf51a4dbea382bb7ec299a394047fb52bbb145b6cbb2d91af8fe63475c025

General

Target

254cf51a4dbea382bb7ec299a394047fb52bbb145b6cbb2d91af8fe63475c025.exe
Size

3.1MB
MD5

5b7e88af055d1b4337e59507c8eba187
SHA1

588cc4e8665f86e5fe1b9bf50597bf67e564094e
SHA256

254cf51a4dbea382bb7ec299a394047fb52bbb145b6cbb2d91af8fe63475c025
SHA512

caa8217152f4aee869d17cbde5d1eb0508737d70a702055724dad7389b63057d754c98a32f9d48cdee98bc35f3b3ba3013392782acdafcf372fc2becb7b71ae6
SSDEEP

49152:mvyI22SsaNYfdPBldt698dBcjH3MQmRmzJjoGdSd7loTHHB72eh2NT:mvf22SsaNYfdPBldt6+dBcjH8QmgA

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.0.103:4782

Mutex

4af63002-10c8-4aa5-8c63-b93df49aa916

Attributes

encryption_key
27CFF25A872374DDAAA32E502C2DC500EFFE191D
install_name
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 payload 3 IoCs

resource	yara_rule
behavioral1/memory/2824-0-0x00000000000C0000-0x00000000003E4000-memory.dmp	family_quasar
behavioral1/files/0x000a000000015c85-6.dat	family_quasar
behavioral1/memory/2872-10-0x0000000000F60000-0x0000000001284000-memory.dmp	family_quasar

Detects Windows executables referencing non-Windows User-Agents 3 IoCs

resource	yara_rule
behavioral1/memory/2824-0-0x00000000000C0000-0x00000000003E4000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral1/files/0x000a000000015c85-6.dat	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral1/memory/2872-10-0x0000000000F60000-0x0000000001284000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 3 IoCs

resource	yara_rule
behavioral1/memory/2824-0-0x00000000000C0000-0x00000000003E4000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral1/files/0x000a000000015c85-6.dat	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral1/memory/2872-10-0x0000000000F60000-0x0000000001284000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers

Detects executables containing common artifacts observed in infostealers 3 IoCs

resource	yara_rule
behavioral1/memory/2824-0-0x00000000000C0000-0x00000000003E4000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer
behavioral1/files/0x000a000000015c85-6.dat	INDICATOR_SUSPICIOUS_GENInfoStealer
behavioral1/memory/2872-10-0x0000000000F60000-0x0000000001284000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer

Executes dropped EXE 1 IoCs

pid	Process
2872	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
2216	schtasks.exe
3024	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2824	254cf51a4dbea382bb7ec299a394047fb52bbb145b6cbb2d91af8fe63475c025.exe
Token: SeDebugPrivilege	2872	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2872	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2824 wrote to memory of 2216	2824	254cf51a4dbea382bb7ec299a394047fb52bbb145b6cbb2d91af8fe63475c025.exe	28
PID 2824 wrote to memory of 2216	2824	254cf51a4dbea382bb7ec299a394047fb52bbb145b6cbb2d91af8fe63475c025.exe	28
PID 2824 wrote to memory of 2216	2824	254cf51a4dbea382bb7ec299a394047fb52bbb145b6cbb2d91af8fe63475c025.exe	28
PID 2824 wrote to memory of 2872	2824	254cf51a4dbea382bb7ec299a394047fb52bbb145b6cbb2d91af8fe63475c025.exe	30
PID 2824 wrote to memory of 2872	2824	254cf51a4dbea382bb7ec299a394047fb52bbb145b6cbb2d91af8fe63475c025.exe	30
PID 2824 wrote to memory of 2872	2824	254cf51a4dbea382bb7ec299a394047fb52bbb145b6cbb2d91af8fe63475c025.exe	30
PID 2872 wrote to memory of 3024	2872	Client.exe	31
PID 2872 wrote to memory of 3024	2872	Client.exe	31
PID 2872 wrote to memory of 3024	2872	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\254cf51a4dbea382bb7ec299a394047fb52bbb145b6cbb2d91af8fe63475c025.exe
"C:\Users\Admin\AppData\Local\Temp\254cf51a4dbea382bb7ec299a394047fb52bbb145b6cbb2d91af8fe63475c025.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2824
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:2216
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2872
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:3024

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

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
5b7e88af055d1b4337e59507c8eba187

SHA1
588cc4e8665f86e5fe1b9bf50597bf67e564094e

SHA256
254cf51a4dbea382bb7ec299a394047fb52bbb145b6cbb2d91af8fe63475c025

SHA512
caa8217152f4aee869d17cbde5d1eb0508737d70a702055724dad7389b63057d754c98a32f9d48cdee98bc35f3b3ba3013392782acdafcf372fc2becb7b71ae6

Download Submit
memory/2824-0-0x00000000000C0000-0x00000000003E4000-memory.dmp

Filesize
3.1MB

Download
memory/2824-1-0x000007FEF55E0000-0x000007FEF5FCC000-memory.dmp

Filesize
9.9MB

Download
memory/2824-2-0x000000001B130000-0x000000001B1B0000-memory.dmp

Filesize
512KB

Download
memory/2824-9-0x000007FEF55E0000-0x000007FEF5FCC000-memory.dmp

Filesize
9.9MB

Download
memory/2872-10-0x0000000000F60000-0x0000000001284000-memory.dmp

Filesize
3.1MB

Download
memory/2872-8-0x000007FEF55E0000-0x000007FEF5FCC000-memory.dmp

Filesize
9.9MB

Download
memory/2872-11-0x0000000000370000-0x00000000003F0000-memory.dmp

Filesize
512KB

Download
memory/2872-12-0x000007FEF55E0000-0x000007FEF5FCC000-memory.dmp

Filesize
9.9MB

Download
memory/2872-13-0x0000000000370000-0x00000000003F0000-memory.dmp

Filesize
512KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads