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 3 IoCs

resource	yara_rule
behavioral1/memory/1904-1-0x00000000001D0000-0x00000000004F4000-memory.dmp	family_quasar
behavioral1/files/0x0030000000016ce8-5.dat	family_quasar
behavioral1/memory/2824-8-0x0000000000A60000-0x0000000000D84000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2824	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
2744	schtasks.exe
2784	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1904	92e33ea42ce90032fd696d413d2e137def473b2a39b3fa4f6070cc0615030892N.exe
Token: SeDebugPrivilege	2824	Bootstrapper.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2824	Bootstrapper.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2824	Bootstrapper.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2824	Bootstrapper.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1904 wrote to memory of 2784	1904	92e33ea42ce90032fd696d413d2e137def473b2a39b3fa4f6070cc0615030892N.exe	31
PID 1904 wrote to memory of 2784	1904	92e33ea42ce90032fd696d413d2e137def473b2a39b3fa4f6070cc0615030892N.exe	31
PID 1904 wrote to memory of 2784	1904	92e33ea42ce90032fd696d413d2e137def473b2a39b3fa4f6070cc0615030892N.exe	31
PID 1904 wrote to memory of 2824	1904	92e33ea42ce90032fd696d413d2e137def473b2a39b3fa4f6070cc0615030892N.exe	33
PID 1904 wrote to memory of 2824	1904	92e33ea42ce90032fd696d413d2e137def473b2a39b3fa4f6070cc0615030892N.exe	33
PID 1904 wrote to memory of 2824	1904	92e33ea42ce90032fd696d413d2e137def473b2a39b3fa4f6070cc0615030892N.exe	33
PID 2824 wrote to memory of 2744	2824	Bootstrapper.exe	34
PID 2824 wrote to memory of 2744	2824	Bootstrapper.exe	34
PID 2824 wrote to memory of 2744	2824	Bootstrapper.exe	34

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:1904
- 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:2784
- 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:2824
- - 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:2744

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/1904-0-0x000007FEF5173000-0x000007FEF5174000-memory.dmp

Filesize
4KB

Download
memory/1904-1-0x00000000001D0000-0x00000000004F4000-memory.dmp

Filesize
3.1MB

Download
memory/1904-2-0x000007FEF5170000-0x000007FEF5B5C000-memory.dmp

Filesize
9.9MB

Download
memory/1904-7-0x000007FEF5170000-0x000007FEF5B5C000-memory.dmp

Filesize
9.9MB

Download
memory/2824-9-0x000007FEF5170000-0x000007FEF5B5C000-memory.dmp

Filesize
9.9MB

Download
memory/2824-8-0x0000000000A60000-0x0000000000D84000-memory.dmp

Filesize
3.1MB

Download
memory/2824-10-0x000007FEF5170000-0x000007FEF5B5C000-memory.dmp

Filesize
9.9MB

Download
memory/2824-11-0x000007FEF5170000-0x000007FEF5B5C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads