quasar | 81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39

General

Target

81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39N.exe
Size

3.1MB
MD5

58a7b2b9800cd7e126a12869c63ab670
SHA1

118f54af16f09cdf086dfa6bf26f1903e3af471f
SHA256

81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39
SHA512

37bfe5f60cbed4f1e9972229a2ba6535a0f7573f036663fb0d3843f756fc1036b53823f60c3bffd3fd1f7652780bf6a47d8e006d72b030ff1632fb446ffa7448
SSDEEP

49152:Pv4t62XlaSFNWPjljiFa2RoUYIYkUh5BxgAoGd66THHB72eh2NT:PvU62XlaSFNWPjljiFXRoUYIYPh3K

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

10.7.0.10:4782

Mutex

0801129f-7edc-4409-8f35-6d3df26fe228

Attributes

encryption_key
E378872B39AA37823907E666E3586D0C1F878A95
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 family
quasar

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2120-1-0x0000000000AF0000-0x0000000000E14000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar
behavioral1/memory/2668-8-0x0000000000D30000-0x0000000001054000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

2668 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

2724 schtasks.exe
2832 schtasks.exe

pid	process
2668	Client.exe

pid	process
2724	schtasks.exe
2832	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39N.exeClient.exe

description	pid	process
Token: SeDebugPrivilege	2120	81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39N.exe
Token: SeDebugPrivilege	2668	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

2668 Client.exe

pid	process
2668	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39N.exeClient.exe

description	pid	process	target process
PID 2120 wrote to memory of 2724	2120	81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39N.exe	schtasks.exe
PID 2120 wrote to memory of 2724	2120	81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39N.exe	schtasks.exe
PID 2120 wrote to memory of 2724	2120	81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39N.exe	schtasks.exe
PID 2120 wrote to memory of 2668	2120	81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39N.exe	Client.exe
PID 2120 wrote to memory of 2668	2120	81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39N.exe	Client.exe
PID 2120 wrote to memory of 2668	2120	81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39N.exe	Client.exe
PID 2668 wrote to memory of 2832	2668	Client.exe	schtasks.exe
PID 2668 wrote to memory of 2832	2668	Client.exe	schtasks.exe
PID 2668 wrote to memory of 2832	2668	Client.exe	schtasks.exe

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\81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39N.exe
"C:\Users\Admin\AppData\Local\Temp\81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39N.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2120
- 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⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2724
- 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:2668
- - 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⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2832

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\Client.exe

Filesize
3.1MB

MD5
58a7b2b9800cd7e126a12869c63ab670

SHA1
118f54af16f09cdf086dfa6bf26f1903e3af471f

SHA256
81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39

SHA512
37bfe5f60cbed4f1e9972229a2ba6535a0f7573f036663fb0d3843f756fc1036b53823f60c3bffd3fd1f7652780bf6a47d8e006d72b030ff1632fb446ffa7448

Download Submit
memory/2120-0-0x000007FEF5683000-0x000007FEF5684000-memory.dmp

Filesize
4KB

Download
memory/2120-1-0x0000000000AF0000-0x0000000000E14000-memory.dmp

Filesize
3.1MB

Download
memory/2120-2-0x000007FEF5680000-0x000007FEF606C000-memory.dmp

Filesize
9.9MB

Download
memory/2120-9-0x000007FEF5680000-0x000007FEF606C000-memory.dmp

Filesize
9.9MB

Download
memory/2668-7-0x000007FEF5680000-0x000007FEF606C000-memory.dmp

Filesize
9.9MB

Download
memory/2668-8-0x0000000000D30000-0x0000000001054000-memory.dmp

Filesize
3.1MB

Download
memory/2668-10-0x000007FEF5680000-0x000007FEF606C000-memory.dmp

Filesize
9.9MB

Download
memory/2668-11-0x000007FEF5680000-0x000007FEF606C000-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