quasar | aea58b72a2a36d5f0401caba08756cad63465d1b40466cb77809f554b6e5d02b

General

Target

Client-built.exe
Size

3.1MB
MD5

a72eb9413e621f09991cb29a3a1209c0
SHA1

ff376c2982c20f671c9d282fa9891c17d2dd7f8d
SHA256

aea58b72a2a36d5f0401caba08756cad63465d1b40466cb77809f554b6e5d02b
SHA512

ef7c21b9b59eb28764c36392635a256dccc2b67896c384736da6ebb30166a2c565550b9967fa206262dcbad5d08e340edf2ea41d897a5b3ba4ced218e3354a3d
SSDEEP

49152:KveI22SsaNYfdPBldt698dBcjHk7RJ6QbR3LoGdmTHHB72eh2NT:KvT22SsaNYfdPBldt6+dBcjHk7RJ6q

Score

10^/10

quasar office04 discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.0.254:4782

Mutex

b5c485dd-0be7-4175-9240-b94d067a1289

Attributes

encryption_key
ACAEE58B1EF31BFCC4D37857EF8688477F9EBF41
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

resource	yara_rule
behavioral2/memory/4608-1-0x0000000000B10000-0x0000000000E34000-memory.dmp	family_quasar
behavioral2/files/0x0008000000023e0e-5.dat	family_quasar

Downloads MZ/PE file 1 IoCs

flow	pid	Process
27	2088	Process not Found

Executes dropped EXE 1 IoCs

pid	Process
4928	Client.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	MicrosoftEdgeUpdate.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
5028	MicrosoftEdgeUpdate.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
1640	schtasks.exe
1192	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4608	Client-built.exe
Token: SeDebugPrivilege	4928	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4928	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4928	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4928	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4608 wrote to memory of 1640	4608	Client-built.exe	89
PID 4608 wrote to memory of 1640	4608	Client-built.exe	89
PID 4608 wrote to memory of 4928	4608	Client-built.exe	91
PID 4608 wrote to memory of 4928	4608	Client-built.exe	91
PID 4928 wrote to memory of 1192	4928	Client.exe	92
PID 4928 wrote to memory of 1192	4928	Client.exe	92

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:4608
- 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:1640
- 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 SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4928
- - 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:1192

C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSIxIiBpbnN0YWxsZGF0ZXRpbWU9IjE3Mzg5NDU4MTUiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4MzQxODE1MzQzMTAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI1MjM2MjE1MDQ5Ii8-PC9hcHA-PC9yZXF1ZXN0Pg
1⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
PID:5028

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

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

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
a72eb9413e621f09991cb29a3a1209c0

SHA1
ff376c2982c20f671c9d282fa9891c17d2dd7f8d

SHA256
aea58b72a2a36d5f0401caba08756cad63465d1b40466cb77809f554b6e5d02b

SHA512
ef7c21b9b59eb28764c36392635a256dccc2b67896c384736da6ebb30166a2c565550b9967fa206262dcbad5d08e340edf2ea41d897a5b3ba4ced218e3354a3d

Download Submit
memory/4608-0-0x00007FFBFC883000-0x00007FFBFC885000-memory.dmp

Filesize
8KB

Download
memory/4608-1-0x0000000000B10000-0x0000000000E34000-memory.dmp

Filesize
3.1MB

Download
memory/4608-2-0x00007FFBFC880000-0x00007FFBFD341000-memory.dmp

Filesize
10.8MB

Download
memory/4608-8-0x00007FFBFC880000-0x00007FFBFD341000-memory.dmp

Filesize
10.8MB

Download
memory/4928-9-0x00007FFBFC880000-0x00007FFBFD341000-memory.dmp

Filesize
10.8MB

Download
memory/4928-10-0x00007FFBFC880000-0x00007FFBFD341000-memory.dmp

Filesize
10.8MB

Download
memory/4928-11-0x000000001C200000-0x000000001C250000-memory.dmp

Filesize
320KB

Download
memory/4928-12-0x000000001C310000-0x000000001C3C2000-memory.dmp

Filesize
712KB

Download
memory/4928-13-0x00007FFBFC880000-0x00007FFBFD341000-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