quasar | fc564833b7c6fc4e991eb80e075d1c36306b9828172609ad311216ec5fc647f4

General

Target

Client-built.exe
Size

3.1MB
MD5

dca77ba52c9e20bdb3fcb81657918f89
SHA1

7cec39d83783008bb9a151b2a71dbc1eb03a7bbf
SHA256

fc564833b7c6fc4e991eb80e075d1c36306b9828172609ad311216ec5fc647f4
SHA512

30fe235a26fe74a1fe27caafe059ee5463790252b046a5e467a0d938f1b77a05c0850a37883066a0d4c7bbd11f1bf36bf7a35e4ef3da86d4f7b2c240f2d8929a
SSDEEP

49152:uv3I22SsaNYfdPBldt698dBcjHOezFXear1QoGdiWTHHB72eh2NT:uv422SsaNYfdPBldt6+dBcjHXZXK

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

10.127.1.2:1604

Mutex

93b40a09-fbd7-4b29-8423-560b40061e4f

Attributes

encryption_key
55EAC2BE7559DA6721E45ED8C2349D6EFC3C9EE2
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

resource	yara_rule
behavioral1/memory/2348-1-0x0000000000910000-0x0000000000C34000-memory.dmp	family_quasar
behavioral1/files/0x0008000000018781-4.dat	family_quasar
behavioral1/memory/1872-8-0x00000000012C0000-0x00000000015E4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1872	Client.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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
2460	schtasks.exe
2976	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2348	Client-built.exe
Token: SeDebugPrivilege	1872	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1872	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
1872	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2348 wrote to memory of 2460	2348	Client-built.exe	30
PID 2348 wrote to memory of 2460	2348	Client-built.exe	30
PID 2348 wrote to memory of 2460	2348	Client-built.exe	30
PID 2348 wrote to memory of 1872	2348	Client-built.exe	32
PID 2348 wrote to memory of 1872	2348	Client-built.exe	32
PID 2348 wrote to memory of 1872	2348	Client-built.exe	32
PID 1872 wrote to memory of 2976	1872	Client.exe	33
PID 1872 wrote to memory of 2976	1872	Client.exe	33
PID 1872 wrote to memory of 2976	1872	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:2348
- 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:2460
- 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 FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:1872
- - 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:2976

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

System Information Discovery

1

T1082

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
dca77ba52c9e20bdb3fcb81657918f89

SHA1
7cec39d83783008bb9a151b2a71dbc1eb03a7bbf

SHA256
fc564833b7c6fc4e991eb80e075d1c36306b9828172609ad311216ec5fc647f4

SHA512
30fe235a26fe74a1fe27caafe059ee5463790252b046a5e467a0d938f1b77a05c0850a37883066a0d4c7bbd11f1bf36bf7a35e4ef3da86d4f7b2c240f2d8929a

Download Submit
memory/1872-7-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

Filesize
9.9MB

Download
memory/1872-8-0x00000000012C0000-0x00000000015E4000-memory.dmp

Filesize
3.1MB

Download
memory/1872-10-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

Filesize
9.9MB

Download
memory/1872-11-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

Filesize
9.9MB

Download
memory/2348-0-0x000007FEF6083000-0x000007FEF6084000-memory.dmp

Filesize
4KB

Download
memory/2348-1-0x0000000000910000-0x0000000000C34000-memory.dmp

Filesize
3.1MB

Download
memory/2348-2-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

Filesize
9.9MB

Download
memory/2348-9-0x000007FEF6080000-0x000007FEF6A6C000-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