quasar | f0992e9e2ea5d5796c8c5c622f7da893d8151d14c46de8b1847a62d7afd08c6d

General

Target

Client-built.exe
Size

3.1MB
MD5

84f03f8b89bb599361ebf000c3fd13ce
SHA1

5507081e72e26ec9bc2d25dec2a14714f7b03318
SHA256

f0992e9e2ea5d5796c8c5c622f7da893d8151d14c46de8b1847a62d7afd08c6d
SHA512

09e5bc0b31a2980a3f1e51dc5964c67147aa16bc7124a5f06e237f79b5436810868f7326afbb35ab25ee1559c531ca15e10f8262aa1a061ac45737a42599f464
SSDEEP

49152:b+KL12toaDsbQPUl+DvccTzVPWj1GTiQjq3Q8Z4IoGtpTHHB72eh2NTd:b+Y12toaDsbQPUl+DvZzVPWjQS7Zl

Score

10^/10

quasar slave discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Slave

C2

85.209.133.13:111

Mutex

ec2a0662-37ce-47bc-80e5-416bb4627d9b

Attributes

encryption_key
D55A711D57A556B5F8341D90111BDC78FB07B322
install_name
System.exe
log_directory
Logs
reconnect_delay
3000
startup_key
system
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/1868-1-0x0000000000C40000-0x0000000000F62000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b97-5.dat	family_quasar

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	System.exe

Executes dropped EXE 2 IoCs

pid	Process
844	System.exe
2316	ZAcNDgH11MfD.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ZAcNDgH11MfD.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
2276	schtasks.exe
4708	schtasks.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	1868	Client-built.exe
Token: SeDebugPrivilege	844	System.exe
Token: SeDebugPrivilege	2316	ZAcNDgH11MfD.exe
Token: 33	2500	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	2500	AUDIODG.EXE

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
844	System.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1868 wrote to memory of 2276	1868	Client-built.exe	82
PID 1868 wrote to memory of 2276	1868	Client-built.exe	82
PID 1868 wrote to memory of 844	1868	Client-built.exe	84
PID 1868 wrote to memory of 844	1868	Client-built.exe	84
PID 844 wrote to memory of 4708	844	System.exe	85
PID 844 wrote to memory of 4708	844	System.exe	85
PID 844 wrote to memory of 2316	844	System.exe	96
PID 844 wrote to memory of 2316	844	System.exe	96
PID 844 wrote to memory of 2316	844	System.exe	96

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:1868
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "system" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\System.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2276
- C:\Users\Admin\AppData\Roaming\SubDir\System.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\System.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:844
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "system" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\System.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4708
- - C:\Users\Admin\AppData\Local\Temp\ZAcNDgH11MfD.exe
    "C:\Users\Admin\AppData\Local\Temp\ZAcNDgH11MfD.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2316

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x300 0x2f8
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2500

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

2

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\ZAcNDgH11MfD.exe

Filesize
871KB

MD5
f8c9192c20757533eaca23b03f66a85b

SHA1
e3a9115956b66808438345ba32fccd4092cfb474

SHA256
5ad88dd4b979320a632275509d94a990538928561ec3ac55ff6ccdcf6f35d8d6

SHA512
3fff05a1e371af1e273c413175f6abe7d374dab6cf46abb6830b45c51286695cd2ae3dd128763d0aa48924ff13634270ecac07c5cad04d406cb7ff3f8aac32db

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\System.exe

Filesize
3.1MB

MD5
84f03f8b89bb599361ebf000c3fd13ce

SHA1
5507081e72e26ec9bc2d25dec2a14714f7b03318

SHA256
f0992e9e2ea5d5796c8c5c622f7da893d8151d14c46de8b1847a62d7afd08c6d

SHA512
09e5bc0b31a2980a3f1e51dc5964c67147aa16bc7124a5f06e237f79b5436810868f7326afbb35ab25ee1559c531ca15e10f8262aa1a061ac45737a42599f464

Download Submit
memory/844-8-0x00007FFF15560000-0x00007FFF16021000-memory.dmp

Filesize
10.8MB

Download
memory/844-15-0x000000001DBC0000-0x000000001DBD2000-memory.dmp

Filesize
72KB

Download
memory/844-17-0x00007FFF15560000-0x00007FFF16021000-memory.dmp

Filesize
10.8MB

Download
memory/844-16-0x000000001E420000-0x000000001E45C000-memory.dmp

Filesize
240KB

Download
memory/844-10-0x00007FFF15560000-0x00007FFF16021000-memory.dmp

Filesize
10.8MB

Download
memory/844-11-0x000000001DB10000-0x000000001DB60000-memory.dmp

Filesize
320KB

Download
memory/844-12-0x000000001DC20000-0x000000001DCD2000-memory.dmp

Filesize
712KB

Download
memory/1868-2-0x00007FFF15560000-0x00007FFF16021000-memory.dmp

Filesize
10.8MB

Download
memory/1868-9-0x00007FFF15560000-0x00007FFF16021000-memory.dmp

Filesize
10.8MB

Download
memory/1868-0-0x00007FFF15563000-0x00007FFF15565000-memory.dmp

Filesize
8KB

Download
memory/1868-1-0x0000000000C40000-0x0000000000F62000-memory.dmp

Filesize
3.1MB

Download
memory/2316-29-0x00000000002D0000-0x00000000003B0000-memory.dmp

Filesize
896KB

Download
memory/2316-30-0x00000000053F0000-0x0000000005994000-memory.dmp

Filesize
5.6MB

Download
memory/2316-31-0x0000000004E40000-0x0000000004ED2000-memory.dmp

Filesize
584KB

Download
memory/2316-32-0x0000000004F30000-0x0000000004F3A000-memory.dmp

Filesize
40KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads