quasar | 1e9796e9439e51cac6936a87fb043cf85d837ece6f26e383bb39e68e1a40d3e5

Analysis

max time kernel
133s
max time network
148s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
16-12-2024 15:26

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General

Target

Client-built.exe
Size

3.1MB
MD5

4cc332d69d4f37340aabf54173ae8365
SHA1

072242c54690924193b29fe8ffb046bef8d393a1
SHA256

1e9796e9439e51cac6936a87fb043cf85d837ece6f26e383bb39e68e1a40d3e5
SHA512

50817fb9f83135156b79b97aa64c753be3495195f16f6acf456961669b4a09b6862dce4da77f61af4cbf01acc0d580d7fde106642098c6291a0982b407f29905
SSDEEP

49152:CvmI22SsaNYfdPBldt698dBcjHsCS1JmLoGd1THHB72eh2NT:Cvr22SsaNYfdPBldt6+dBcjHsC1

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

5.20.104.111:4782

Mutex

beca179f-e7d8-40de-ba85-d1fd906529dd

Attributes

encryption_key
66CB84A8DB676E9F5F54FDDB146D727FB936CCFD
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Microsoft Defender
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 3 IoCs

resource	yara_rule
behavioral1/memory/576-1-0x0000000000940000-0x0000000000C64000-memory.dmp	family_quasar
behavioral1/files/0x0012000000016d3f-6.dat	family_quasar
behavioral1/memory/2868-9-0x00000000008E0000-0x0000000000C04000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2868	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

pid	Process
2260	schtasks.exe
2920	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	576	Client-built.exe
Token: SeDebugPrivilege	2868	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 576 wrote to memory of 2260	576	Client-built.exe	30
PID 576 wrote to memory of 2260	576	Client-built.exe	30
PID 576 wrote to memory of 2260	576	Client-built.exe	30
PID 576 wrote to memory of 2868	576	Client-built.exe	32
PID 576 wrote to memory of 2868	576	Client-built.exe	32
PID 576 wrote to memory of 2868	576	Client-built.exe	32
PID 2868 wrote to memory of 2920	2868	Client.exe	33
PID 2868 wrote to memory of 2920	2868	Client.exe	33
PID 2868 wrote to memory of 2920	2868	Client.exe	33

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⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:576
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Microsoft Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2260
- 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 WriteProcessMemory
  PID:2868
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Microsoft Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2920

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

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
4cc332d69d4f37340aabf54173ae8365

SHA1
072242c54690924193b29fe8ffb046bef8d393a1

SHA256
1e9796e9439e51cac6936a87fb043cf85d837ece6f26e383bb39e68e1a40d3e5

SHA512
50817fb9f83135156b79b97aa64c753be3495195f16f6acf456961669b4a09b6862dce4da77f61af4cbf01acc0d580d7fde106642098c6291a0982b407f29905

Download Submit
memory/576-0-0x000007FEF6423000-0x000007FEF6424000-memory.dmp

Filesize
4KB

Download
memory/576-1-0x0000000000940000-0x0000000000C64000-memory.dmp

Filesize
3.1MB

Download
memory/576-2-0x000007FEF6420000-0x000007FEF6E0C000-memory.dmp

Filesize
9.9MB

Download
memory/576-8-0x000007FEF6420000-0x000007FEF6E0C000-memory.dmp

Filesize
9.9MB

Download
memory/2868-9-0x00000000008E0000-0x0000000000C04000-memory.dmp

Filesize
3.1MB

Download
memory/2868-11-0x000007FEF6420000-0x000007FEF6E0C000-memory.dmp

Filesize
9.9MB

Download
memory/2868-10-0x000007FEF6420000-0x000007FEF6E0C000-memory.dmp

Filesize
9.9MB

Download
memory/2868-12-0x000007FEF6420000-0x000007FEF6E0C000-memory.dmp

Filesize
9.9MB

Download

Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads