quasar | 71db00e41487326acc2eb737a22faa26011d78ba242c408b108b0f7b8124b9f0

General

Target

Client-built.exe
Size

3.1MB
MD5

00cafff0e897b2ac4d0bb4ea8171f87a
SHA1

fa6224090a7a53f328f7bf74072776ce991f01bb
SHA256

71db00e41487326acc2eb737a22faa26011d78ba242c408b108b0f7b8124b9f0
SHA512

d4fb8277d5b48176542f318eaf9f202a12cc8a3a3bc825245bcda73ea78c6e4c2d6be2013901e5cb1c369f8eb86934bb4990781fd7b60681928e447761cc6979
SSDEEP

49152:7v3lL26AaNeWgPhlmVqvMQ7XSKQERJ6BbR3LoGd6THHB72eh2NT:7v1L26AaNeWgPhlmVqkQ7XSKQERJ6j

Score

10^/10

quasar first spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

first

C2

quasartestingxxx.hopto.org:4782

Mutex

44382739-6e8e-4a03-b838-6ed9f8f4bf36

Attributes

encryption_key
59DD70006F5E5424ACBA442199524AA9815F439E
install_name
Calculator.exe
log_directory
Logs
reconnect_delay
3000
startup_key
RtkAudUService86
subdirectory
Calculator_UWP

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/2524-1-0x0000000000850000-0x0000000000B74000-memory.dmp	family_quasar
behavioral1/files/0x000700000001945b-5.dat	family_quasar
behavioral1/memory/2408-8-0x0000000001280000-0x00000000015A4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2408	Calculator.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
2668	schtasks.exe
292	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2524	Client-built.exe
Token: SeDebugPrivilege	2408	Calculator.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2408	Calculator.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2408	Calculator.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2524 wrote to memory of 2668	2524	Client-built.exe	30
PID 2524 wrote to memory of 2668	2524	Client-built.exe	30
PID 2524 wrote to memory of 2668	2524	Client-built.exe	30
PID 2524 wrote to memory of 2408	2524	Client-built.exe	32
PID 2524 wrote to memory of 2408	2524	Client-built.exe	32
PID 2524 wrote to memory of 2408	2524	Client-built.exe	32
PID 2408 wrote to memory of 292	2408	Calculator.exe	33
PID 2408 wrote to memory of 292	2408	Calculator.exe	33
PID 2408 wrote to memory of 292	2408	Calculator.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:2524
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "RtkAudUService86" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Calculator_UWP\Calculator.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2668
- C:\Users\Admin\AppData\Roaming\Calculator_UWP\Calculator.exe
  "C:\Users\Admin\AppData\Roaming\Calculator_UWP\Calculator.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:2408
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "RtkAudUService86" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Calculator_UWP\Calculator.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:292

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\Calculator_UWP\Calculator.exe

Filesize
3.1MB

MD5
00cafff0e897b2ac4d0bb4ea8171f87a

SHA1
fa6224090a7a53f328f7bf74072776ce991f01bb

SHA256
71db00e41487326acc2eb737a22faa26011d78ba242c408b108b0f7b8124b9f0

SHA512
d4fb8277d5b48176542f318eaf9f202a12cc8a3a3bc825245bcda73ea78c6e4c2d6be2013901e5cb1c369f8eb86934bb4990781fd7b60681928e447761cc6979

Download Submit
memory/2408-8-0x0000000001280000-0x00000000015A4000-memory.dmp

Filesize
3.1MB

Download
memory/2408-9-0x000007FEF5DC0000-0x000007FEF67AC000-memory.dmp

Filesize
9.9MB

Download
memory/2408-10-0x000007FEF5DC0000-0x000007FEF67AC000-memory.dmp

Filesize
9.9MB

Download
memory/2408-11-0x000007FEF5DC0000-0x000007FEF67AC000-memory.dmp

Filesize
9.9MB

Download
memory/2524-0-0x000007FEF5DC3000-0x000007FEF5DC4000-memory.dmp

Filesize
4KB

Download
memory/2524-1-0x0000000000850000-0x0000000000B74000-memory.dmp

Filesize
3.1MB

Download
memory/2524-2-0x000007FEF5DC0000-0x000007FEF67AC000-memory.dmp

Filesize
9.9MB

Download
memory/2524-7-0x000007FEF5DC0000-0x000007FEF67AC000-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