quasar | 1a5f35980c44bc927abe47bef7435177f44f0d8a4c7632a6de4024e2716e85e0

Analysis

max time kernel
102s
max time network
118s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
10-12-2024 06:49

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General

Target

1a5f35980c44bc927abe47bef7435177f44f0d8a4c7632a6de4024e2716e85e0.exe
Size

3.1MB
MD5

fe9288f31b98a1d42d805ceba700fb39
SHA1

208a5912e6086a4a3266b9f11346ae77ad8a35ff
SHA256

1a5f35980c44bc927abe47bef7435177f44f0d8a4c7632a6de4024e2716e85e0
SHA512

b9adfd4e75be72198ff06447cd67d8f852625c3ef61eff9247dfd1e4941fae58866debdc4b8aa8921f5c448eec18e3106436896f79b70b47af6e2bdf64ccb2a9
SSDEEP

49152:Vvht62XlaSFNWPjljiFa2RoUYIdqWhybRjPLoGddJfTHHB72eh2NTd:VvL62XlaSFNWPjljiFXRoUYIdqWhWT6

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.17:5555

Mutex

3b1732e2-6a81-44bb-8d99-4472451b1cf3

Attributes

encryption_key
871AD53C1EE1C8F197D53D3E1DCA45CC62B82B8D
install_name
javaconfig.exe
log_directory
Logs
reconnect_delay
3000
startup_key
JavaUpdater
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/2624-1-0x0000000000580000-0x00000000008A6000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023c8b-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4052	javaconfig.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
4492	schtasks.exe
1556	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2624	1a5f35980c44bc927abe47bef7435177f44f0d8a4c7632a6de4024e2716e85e0.exe
Token: SeDebugPrivilege	4052	javaconfig.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4052	javaconfig.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4052	javaconfig.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4052	javaconfig.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2624 wrote to memory of 4492	2624	1a5f35980c44bc927abe47bef7435177f44f0d8a4c7632a6de4024e2716e85e0.exe	83
PID 2624 wrote to memory of 4492	2624	1a5f35980c44bc927abe47bef7435177f44f0d8a4c7632a6de4024e2716e85e0.exe	83
PID 2624 wrote to memory of 4052	2624	1a5f35980c44bc927abe47bef7435177f44f0d8a4c7632a6de4024e2716e85e0.exe	85
PID 2624 wrote to memory of 4052	2624	1a5f35980c44bc927abe47bef7435177f44f0d8a4c7632a6de4024e2716e85e0.exe	85
PID 4052 wrote to memory of 1556	4052	javaconfig.exe	86
PID 4052 wrote to memory of 1556	4052	javaconfig.exe	86

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\1a5f35980c44bc927abe47bef7435177f44f0d8a4c7632a6de4024e2716e85e0.exe
"C:\Users\Admin\AppData\Local\Temp\1a5f35980c44bc927abe47bef7435177f44f0d8a4c7632a6de4024e2716e85e0.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2624
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "JavaUpdater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\javaconfig.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4492
- C:\Users\Admin\AppData\Roaming\SubDir\javaconfig.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\javaconfig.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:4052
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "JavaUpdater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\javaconfig.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1556

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
3.1MB

MD5
fe9288f31b98a1d42d805ceba700fb39

SHA1
208a5912e6086a4a3266b9f11346ae77ad8a35ff

SHA256
1a5f35980c44bc927abe47bef7435177f44f0d8a4c7632a6de4024e2716e85e0

SHA512
b9adfd4e75be72198ff06447cd67d8f852625c3ef61eff9247dfd1e4941fae58866debdc4b8aa8921f5c448eec18e3106436896f79b70b47af6e2bdf64ccb2a9

Download Submit
memory/2624-0-0x00007FFF61233000-0x00007FFF61235000-memory.dmp

Filesize
8KB

Download
memory/2624-1-0x0000000000580000-0x00000000008A6000-memory.dmp

Filesize
3.1MB

Download
memory/2624-2-0x00007FFF61230000-0x00007FFF61CF1000-memory.dmp

Filesize
10.8MB

Download
memory/2624-10-0x00007FFF61230000-0x00007FFF61CF1000-memory.dmp

Filesize
10.8MB

Download
memory/4052-9-0x00007FFF61230000-0x00007FFF61CF1000-memory.dmp

Filesize
10.8MB

Download
memory/4052-11-0x00007FFF61230000-0x00007FFF61CF1000-memory.dmp

Filesize
10.8MB

Download
memory/4052-12-0x000000001B570000-0x000000001B5C0000-memory.dmp

Filesize
320KB

Download
memory/4052-13-0x000000001BDD0000-0x000000001BE82000-memory.dmp

Filesize
712KB

Download
memory/4052-14-0x00007FFF61230000-0x00007FFF61CF1000-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