quasar | 92e33ea42ce90032fd696d413d2e137def473b2a39b3fa4f6070cc0615030892

General

Target

92e33ea42ce90032fd696d413d2e137def473b2a39b3fa4f6070cc0615030892N.exe
Size

3.1MB
MD5

4b3436647f1997577f466e21705552c0
SHA1

2f18780b0861be443a485972a90f8ea7b3b251a1
SHA256

92e33ea42ce90032fd696d413d2e137def473b2a39b3fa4f6070cc0615030892
SHA512

b72e3ab3f13b509731e5ee41160da2ac9539f9cdc58b329f145ec497e0f62b5e26e552e5e7b23dfe431f76f1d6d9de4cdbaf87ddea7dfdac934ce8701a360c4c
SSDEEP

49152:7vPlL26AaNeWgPhlmVqvMQ7XSKhYYhBxVpoGdjTHHB72eh2NT:7vdL26AaNeWgPhlmVqkQ7XSKqYd

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.75:4782

Mutex

52ebf697-f063-428e-8231-fb3219c7b674

Attributes

encryption_key
D4BE47CAF450CEF86308505E2B6631E7606F614F
install_name
Bootstrapper.exe
log_directory
Logs
reconnect_delay
3000
startup_key
WIndows Client Startup 64x
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/1116-1-0x0000000000D90000-0x00000000010B4000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b58-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3416	Bootstrapper.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
4972	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1116	92e33ea42ce90032fd696d413d2e137def473b2a39b3fa4f6070cc0615030892N.exe
Token: SeDebugPrivilege	3416	Bootstrapper.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3416	Bootstrapper.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3416	Bootstrapper.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3416	Bootstrapper.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1116 wrote to memory of 4972	1116	92e33ea42ce90032fd696d413d2e137def473b2a39b3fa4f6070cc0615030892N.exe	82
PID 1116 wrote to memory of 4972	1116	92e33ea42ce90032fd696d413d2e137def473b2a39b3fa4f6070cc0615030892N.exe	82
PID 1116 wrote to memory of 3416	1116	92e33ea42ce90032fd696d413d2e137def473b2a39b3fa4f6070cc0615030892N.exe	84
PID 1116 wrote to memory of 3416	1116	92e33ea42ce90032fd696d413d2e137def473b2a39b3fa4f6070cc0615030892N.exe	84
PID 3416 wrote to memory of 2668	3416	Bootstrapper.exe	85
PID 3416 wrote to memory of 2668	3416	Bootstrapper.exe	85

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\92e33ea42ce90032fd696d413d2e137def473b2a39b3fa4f6070cc0615030892N.exe
"C:\Users\Admin\AppData\Local\Temp\92e33ea42ce90032fd696d413d2e137def473b2a39b3fa4f6070cc0615030892N.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1116
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "WIndows Client Startup 64x" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Bootstrapper.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4972
- C:\Users\Admin\AppData\Roaming\SubDir\Bootstrapper.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Bootstrapper.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:3416
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "WIndows Client Startup 64x" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Bootstrapper.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2668

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\SubDir\Bootstrapper.exe

Filesize
3.1MB

MD5
4b3436647f1997577f466e21705552c0

SHA1
2f18780b0861be443a485972a90f8ea7b3b251a1

SHA256
92e33ea42ce90032fd696d413d2e137def473b2a39b3fa4f6070cc0615030892

SHA512
b72e3ab3f13b509731e5ee41160da2ac9539f9cdc58b329f145ec497e0f62b5e26e552e5e7b23dfe431f76f1d6d9de4cdbaf87ddea7dfdac934ce8701a360c4c

Download Submit
memory/1116-0-0x00007FFDF20F3000-0x00007FFDF20F5000-memory.dmp

Filesize
8KB

Download
memory/1116-1-0x0000000000D90000-0x00000000010B4000-memory.dmp

Filesize
3.1MB

Download
memory/1116-2-0x00007FFDF20F0000-0x00007FFDF2BB1000-memory.dmp

Filesize
10.8MB

Download
memory/1116-8-0x00007FFDF20F0000-0x00007FFDF2BB1000-memory.dmp

Filesize
10.8MB

Download
memory/3416-9-0x00007FFDF20F0000-0x00007FFDF2BB1000-memory.dmp

Filesize
10.8MB

Download
memory/3416-10-0x00007FFDF20F0000-0x00007FFDF2BB1000-memory.dmp

Filesize
10.8MB

Download
memory/3416-11-0x000000001C010000-0x000000001C060000-memory.dmp

Filesize
320KB

Download
memory/3416-12-0x000000001C120000-0x000000001C1D2000-memory.dmp

Filesize
712KB

Download
memory/3416-13-0x00007FFDF20F0000-0x00007FFDF2BB1000-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