quasar | 17473731182bcea4cee088d78f802ea947926a5cbc8708b4ba31d7585ee8b19f

Analysis

max time kernel
130s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20230220-en
resource tags

arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
submitted
29/03/2023, 20:42

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General

Target

tmp.exe
Size

502KB
MD5

3630b92ac5ed33de5eb53b563913bb02
SHA1

34828f9a66c2c9c0f0cf93419dc96a62bfea476b
SHA256

17473731182bcea4cee088d78f802ea947926a5cbc8708b4ba31d7585ee8b19f
SHA512

034d8e4509816f18f2f75996914d9ef179985a5d53e002b982e208030d2b60413faec917ad6ac1e02f609261d57bb88221c7840271ab64f3cc0b54e3c2b5501b
SSDEEP

12288:dTEgdfYjbg+qBTaa4EywIGpYR1MIwcdD:+UwzgXywIGpYR6IwcdD

Score

10^/10

quasar office05 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office05

needforrat.hopto.org:7771

Mutex

d70dba78-082d-4d62-9d71-b4a1c6961022

Attributes

encryption_key
110272D9471BA005C613D451E07D98ABB8403AED
install_name
Client1.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Defender
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral2/memory/3420-133-0x0000000000580000-0x0000000000604000-memory.dmp	family_quasar
behavioral2/files/0x000300000000073b-137.dat	family_quasar
behavioral2/files/0x000300000000073b-138.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1880	Client1.exe

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
3096	schtasks.exe
1592	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3420	tmp.exe
Token: SeDebugPrivilege	1880	Client1.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1880	Client1.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
1880	Client1.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1880	Client1.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3420 wrote to memory of 3096	3420	tmp.exe	86
PID 3420 wrote to memory of 3096	3420	tmp.exe	86
PID 3420 wrote to memory of 1880	3420	tmp.exe	88
PID 3420 wrote to memory of 1880	3420	tmp.exe	88
PID 1880 wrote to memory of 1592	1880	Client1.exe	91
PID 1880 wrote to memory of 1592	1880	Client1.exe	91

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\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3420
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Windows Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\tmp.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:3096
- C:\Users\Admin\AppData\Roaming\SubDir\Client1.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client1.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:1880
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client1.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:1592

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client1.exe

Filesize
502KB

MD5
3630b92ac5ed33de5eb53b563913bb02

SHA1
34828f9a66c2c9c0f0cf93419dc96a62bfea476b

SHA256
17473731182bcea4cee088d78f802ea947926a5cbc8708b4ba31d7585ee8b19f

SHA512
034d8e4509816f18f2f75996914d9ef179985a5d53e002b982e208030d2b60413faec917ad6ac1e02f609261d57bb88221c7840271ab64f3cc0b54e3c2b5501b

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client1.exe

Filesize
502KB

MD5
3630b92ac5ed33de5eb53b563913bb02

SHA1
34828f9a66c2c9c0f0cf93419dc96a62bfea476b

SHA256
17473731182bcea4cee088d78f802ea947926a5cbc8708b4ba31d7585ee8b19f

SHA512
034d8e4509816f18f2f75996914d9ef179985a5d53e002b982e208030d2b60413faec917ad6ac1e02f609261d57bb88221c7840271ab64f3cc0b54e3c2b5501b

Download Submit
memory/1880-140-0x000000001AFC0000-0x000000001AFD0000-memory.dmp

Filesize
64KB

Download
memory/1880-141-0x000000001CF80000-0x000000001CFD0000-memory.dmp

Filesize
320KB

Download
memory/1880-142-0x000000001D090000-0x000000001D142000-memory.dmp

Filesize
712KB

Download
memory/1880-143-0x000000001AFC0000-0x000000001AFD0000-memory.dmp

Filesize
64KB

Download
memory/3420-133-0x0000000000580000-0x0000000000604000-memory.dmp

Filesize
528KB

Download
memory/3420-134-0x00000000026D0000-0x00000000026E0000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads