quasar | 1b05c4d74e0d17a983f9b91aa706a7a60f37ec270b7e2433d6798afa1c7be766 | Triage

Analysis

max time kernel
30s
max time network
18s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
31/01/2025, 06:03

Sharing

Report Analysis Logs

General

Target

spectrum.exe
Size

502KB
MD5

1441905fc4082ee6055ea39f5875a6c5
SHA1

78f91f9f9ffe47e5f47e9844bd026d150146744e
SHA256

1b05c4d74e0d17a983f9b91aa706a7a60f37ec270b7e2433d6798afa1c7be766
SHA512

70e9ab0e49b4bf89505f16c499538daebc1e8da72488cd63ff60747d15a1d486ba38802b0622c9240d10ff68ab32e6bb36a0b809e7cd0e2ec4945d023ce86c5c
SSDEEP

12288:gTEgdfYe/iKg3qFE4/ywNFpdrdwzTCcdj:1UwC5F9ywNFpdJ7cdj

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office04

C2

192.168.31.99:4782

2001:4bc9:1f98:a4e::676:4782

255.255.255.0:4782

fe80::cabf:4cff:fe84:9572%17:4782

Mutex

1f65a787-81b8-4955-95e4-b7751e10cd50

Attributes

encryption_key
A0B82A50BBC49EC084E3E53A9E34DF58BD7050B9
install_name
Java Updater.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Java Updater
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
behavioral4/memory/2532-1-0x0000000000750000-0x00000000007D4000-memory.dmp	family_quasar
behavioral4/files/0x001d00000002aab1-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4972	Java Updater.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

pid	Process
680	schtasks.exe
2128	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2532	spectrum.exe
Token: SeDebugPrivilege	4972	Java Updater.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4972	Java Updater.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2532 wrote to memory of 680	2532	spectrum.exe	77
PID 2532 wrote to memory of 680	2532	spectrum.exe	77
PID 2532 wrote to memory of 4972	2532	spectrum.exe	79
PID 2532 wrote to memory of 4972	2532	spectrum.exe	79
PID 4972 wrote to memory of 2128	4972	Java Updater.exe	80
PID 4972 wrote to memory of 2128	4972	Java Updater.exe	80

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\spectrum.exe
"C:\Users\Admin\AppData\Local\Temp\spectrum.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2532
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Java Updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\spectrum.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:680
- C:\Users\Admin\AppData\Roaming\SubDir\Java Updater.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Java Updater.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4972
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Java Updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Java Updater.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2128

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Scheduled Task

Persistence

Scheduled Task/Job

Scheduled Task

Privilege Escalation

Scheduled Task/Job

Scheduled Task

Defense Evasion

Credential Access

Discovery

Query Registry

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Java Updater.exe

Filesize
502KB

MD5
1441905fc4082ee6055ea39f5875a6c5

SHA1
78f91f9f9ffe47e5f47e9844bd026d150146744e

SHA256
1b05c4d74e0d17a983f9b91aa706a7a60f37ec270b7e2433d6798afa1c7be766

SHA512
70e9ab0e49b4bf89505f16c499538daebc1e8da72488cd63ff60747d15a1d486ba38802b0622c9240d10ff68ab32e6bb36a0b809e7cd0e2ec4945d023ce86c5c

Download Submit
memory/2532-0-0x00007FFF1FA13000-0x00007FFF1FA15000-memory.dmp

Filesize
8KB

Download
memory/2532-1-0x0000000000750000-0x00000000007D4000-memory.dmp

Filesize
528KB

Download
memory/2532-2-0x00007FFF1FA10000-0x00007FFF204D2000-memory.dmp

Filesize
10.8MB

Download
memory/2532-9-0x00007FFF1FA10000-0x00007FFF204D2000-memory.dmp

Filesize
10.8MB

Download
memory/4972-8-0x00007FFF1FA10000-0x00007FFF204D2000-memory.dmp

Filesize
10.8MB

Download
memory/4972-10-0x00007FFF1FA10000-0x00007FFF204D2000-memory.dmp

Filesize
10.8MB

Download
memory/4972-11-0x000000001B340000-0x000000001B390000-memory.dmp

Filesize
320KB

Download
memory/4972-12-0x000000001BC70000-0x000000001BD22000-memory.dmp

Filesize
712KB

Download
memory/4972-13-0x00007FFF1FA10000-0x00007FFF204D2000-memory.dmp

Filesize
10.8MB

Download