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 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3132-1-0x00000000000F0000-0x0000000000414000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

2036 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

4788 schtasks.exe
2316 schtasks.exe

pid	process
2036	Client.exe

pid	process
4788	schtasks.exe
2316	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39N.exeClient.exe

description	pid	process
Token: SeDebugPrivilege	3132	81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39N.exe
Token: SeDebugPrivilege	2036	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

2036 Client.exe

pid	process
2036	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39N.exeClient.exe

description	pid	process	target process
PID 3132 wrote to memory of 4788	3132	81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39N.exe	schtasks.exe
PID 3132 wrote to memory of 4788	3132	81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39N.exe	schtasks.exe
PID 3132 wrote to memory of 2036	3132	81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39N.exe	Client.exe
PID 3132 wrote to memory of 2036	3132	81482c1a6d2f01cc87ef30cbc62dcaa2690a33868b2bb9b317419eec2bb28c39N.exe	Client.exe
PID 2036 wrote to memory of 2316	2036	Client.exe	schtasks.exe
PID 2036 wrote to memory of 2316	2036	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:3132
- 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:4788
- 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:2036
- - 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:2316

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/2036-9-0x00007FF99D840000-0x00007FF99E301000-memory.dmp

Filesize
10.8MB

Download
memory/2036-10-0x00007FF99D840000-0x00007FF99E301000-memory.dmp

Filesize
10.8MB

Download
memory/2036-11-0x000000001BFC0000-0x000000001C010000-memory.dmp

Filesize
320KB

Download
memory/2036-12-0x000000001C7D0000-0x000000001C882000-memory.dmp

Filesize
712KB

Download
memory/2036-13-0x00007FF99D840000-0x00007FF99E301000-memory.dmp

Filesize
10.8MB

Download
memory/3132-0-0x00007FF99D843000-0x00007FF99D845000-memory.dmp

Filesize
8KB

Download
memory/3132-1-0x00000000000F0000-0x0000000000414000-memory.dmp

Filesize
3.1MB

Download
memory/3132-2-0x00007FF99D840000-0x00007FF99E301000-memory.dmp

Filesize
10.8MB

Download
memory/3132-8-0x00007FF99D840000-0x00007FF99E301000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads