quasar | 1b05c4d74e0d17a983f9b91aa706a7a60f37ec270b7e2433d6798afa1c7be766

Analysis

max time kernel
143s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
17/12/2024, 02:20

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General

Target
1b05c4d74e0d17a983f9b91aa706a7a60f37ec270b7e2433d6798afa1c7be766.exe
Size 502KB
Sample241217-csf7naykhj
SHA256 1b05c4d74e0d17a983f9b91aa706a7a60f37ec270b7e2433d6798afa1c7be766
MD5 1441905fc4082ee6055ea39f5875a6c5
SHA1 78f91f9f9ffe47e5f47e9844bd026d150146744e
SHA512 70e9ab0e49b4bf89505f16c499538daebc1e8da72488cd63ff60747d15a1d486ba38802b0622c9240d10ff68ab32e6bb36a0b809e7cd0e2ec4945d023ce86c5c
SSDEEP 12288:gTEgdfYe/iKg3qFE4/ywNFpdrdwzTCcdj:1UwC5F9ywNFpdJ7cdj
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office04

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
behavioral2/memory/3668-1-0x0000000000640000-0x00000000006C4000-memory.dmp	family_quasar
behavioral2/files/0x000b000000023b72-4.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3124	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

T1053.005

pid	Process
1420	schtasks.exe
4464	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3668	1b05c4d74e0d17a983f9b91aa706a7a60f37ec270b7e2433d6798afa1c7be766.exe
Token: SeDebugPrivilege	3124	Java Updater.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3124	Java Updater.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3668 wrote to memory of 1420	3668	1b05c4d74e0d17a983f9b91aa706a7a60f37ec270b7e2433d6798afa1c7be766.exe	83
PID 3668 wrote to memory of 1420	3668	1b05c4d74e0d17a983f9b91aa706a7a60f37ec270b7e2433d6798afa1c7be766.exe	83
PID 3668 wrote to memory of 3124	3668	1b05c4d74e0d17a983f9b91aa706a7a60f37ec270b7e2433d6798afa1c7be766.exe	85
PID 3668 wrote to memory of 3124	3668	1b05c4d74e0d17a983f9b91aa706a7a60f37ec270b7e2433d6798afa1c7be766.exe	85
PID 3124 wrote to memory of 4464	3124	Java Updater.exe	86
PID 3124 wrote to memory of 4464	3124	Java Updater.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\1b05c4d74e0d17a983f9b91aa706a7a60f37ec270b7e2433d6798afa1c7be766.exe
"C:\Users\Admin\AppData\Local\Temp\1b05c4d74e0d17a983f9b91aa706a7a60f37ec270b7e2433d6798afa1c7be766.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3668
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Java Updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\1b05c4d74e0d17a983f9b91aa706a7a60f37ec270b7e2433d6798afa1c7be766.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1420
- 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:3124
- - 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:4464

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

Java Updater.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Java Updater.exe
Size 502KB
SHA256 1b05c4d74e0d17a983f9b91aa706a7a60f37ec270b7e2433d6798afa1c7be766
MD5 1441905fc4082ee6055ea39f5875a6c5
SHA1 78f91f9f9ffe47e5f47e9844bd026d150146744e
SHA512 70e9ab0e49b4bf89505f16c499538daebc1e8da72488cd63ff60747d15a1d486ba38802b0622c9240d10ff68ab32e6bb36a0b809e7cd0e2ec4945d023ce86c5c
SSDEEP 12288:gTEgdfYe/iKg3qFE4/ywNFpdrdwzTCcdj:1UwC5F9ywNFpdJ7cdj
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/3124-8-0x00007FFC30340000-0x00007FFC30E01000-memory.dmp

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memory/3124-9-0x00007FFC30340000-0x00007FFC30E01000-memory.dmp

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memory/3124-10-0x000000001B4B0000-0x000000001B500000-memory.dmp

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memory/3124-11-0x000000001B5C0000-0x000000001B672000-memory.dmp

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memory/3124-13-0x00007FFC30340000-0x00007FFC30E01000-memory.dmp

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memory/3668-0-0x00007FFC30343000-0x00007FFC30345000-memory.dmp

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memory/3668-1-0x0000000000640000-0x00000000006C4000-memory.dmp

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memory/3668-2-0x00007FFC30340000-0x00007FFC30E01000-memory.dmp

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memory/3668-12-0x00007FFC30340000-0x00007FFC30E01000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads