quasar | c509ea51e44a654f104ab9fb8e5d681a871159c73fcf3f666245e303387329b2

General

Target
c509ea51e44a654f104ab9fb8e5d681a871159c73fcf3f666245e303387329b2.exe
Size 3.1MB
Sample240530-byfbwaaf49
SHA256 c509ea51e44a654f104ab9fb8e5d681a871159c73fcf3f666245e303387329b2
MD5 e3d628461d24faf2ad61e1305ed99542
SHA1 aefcdd93114397de51ce8f63e9ef96b65a5b5c11
SHA512 20d47ef82c1dde83325d088c69ff9ae6f968b0a19d652f5ed2f21b1531c86fbf0b49e9df0d524c1333001c7565a8a56039aa31bb82ceba63c41b989dc8fcc991
SSDEEP 49152:xvSlL26AaNeWgPhlmVqvMQ7XSK0bLimzCCoGdITHHB72eh2NT:xvKL26AaNeWgPhlmVqkQ7XSK0bLz
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

31.177.108.29:4782

Mutex

553dcf2c-4c70-4c0c-935a-2e078a46f03e

Attributes

encryption_key
DAFF70D249B4EC619D5A052FDD3418E3549FF268
install_name
KR6nDu9fLhop1bFe.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Defender.Process
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 3 IoCs

resource	yara_rule
behavioral1/memory/2864-1-0x0000000000D70000-0x0000000001094000-memory.dmp	family_quasar
behavioral1/files/0x0037000000014708-6.dat	family_quasar
behavioral1/memory/1648-9-0x0000000000AB0000-0x0000000000DD4000-memory.dmp	family_quasar

Detects Windows executables referencing non-Windows User-Agents 3 IoCs

resource	yara_rule
behavioral1/memory/2864-1-0x0000000000D70000-0x0000000001094000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral1/files/0x0037000000014708-6.dat	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral1/memory/1648-9-0x0000000000AB0000-0x0000000000DD4000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 3 IoCs

resource	yara_rule
behavioral1/memory/2864-1-0x0000000000D70000-0x0000000001094000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral1/files/0x0037000000014708-6.dat	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral1/memory/1648-9-0x0000000000AB0000-0x0000000000DD4000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers

Detects executables containing common artifacts observed in infostealers 3 IoCs

resource	yara_rule
behavioral1/memory/2864-1-0x0000000000D70000-0x0000000001094000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer
behavioral1/files/0x0037000000014708-6.dat	INDICATOR_SUSPICIOUS_GENInfoStealer
behavioral1/memory/1648-9-0x0000000000AB0000-0x0000000000DD4000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer

Executes dropped EXE 1 IoCs

pid	Process
1648	KR6nDu9fLhop1bFe.exe

Creates scheduled task(s) 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
1768	schtasks.exe
2596	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2864	c509ea51e44a654f104ab9fb8e5d681a871159c73fcf3f666245e303387329b2.exe
Token: SeDebugPrivilege	1648	KR6nDu9fLhop1bFe.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1648	KR6nDu9fLhop1bFe.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2864 wrote to memory of 1768	2864	c509ea51e44a654f104ab9fb8e5d681a871159c73fcf3f666245e303387329b2.exe	28
PID 2864 wrote to memory of 1768	2864	c509ea51e44a654f104ab9fb8e5d681a871159c73fcf3f666245e303387329b2.exe	28
PID 2864 wrote to memory of 1768	2864	c509ea51e44a654f104ab9fb8e5d681a871159c73fcf3f666245e303387329b2.exe	28
PID 2864 wrote to memory of 1648	2864	c509ea51e44a654f104ab9fb8e5d681a871159c73fcf3f666245e303387329b2.exe	30
PID 2864 wrote to memory of 1648	2864	c509ea51e44a654f104ab9fb8e5d681a871159c73fcf3f666245e303387329b2.exe	30
PID 2864 wrote to memory of 1648	2864	c509ea51e44a654f104ab9fb8e5d681a871159c73fcf3f666245e303387329b2.exe	30
PID 1648 wrote to memory of 2596	1648	KR6nDu9fLhop1bFe.exe	31
PID 1648 wrote to memory of 2596	1648	KR6nDu9fLhop1bFe.exe	31
PID 1648 wrote to memory of 2596	1648	KR6nDu9fLhop1bFe.exe	31

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\c509ea51e44a654f104ab9fb8e5d681a871159c73fcf3f666245e303387329b2.exe
"C:\Users\Admin\AppData\Local\Temp\c509ea51e44a654f104ab9fb8e5d681a871159c73fcf3f666245e303387329b2.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2864
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Defender.Process" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:1768
- C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1648
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Defender.Process" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2596

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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KR6nDu9fLhop1bFe.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe
Size 3.1MB
SHA256 c509ea51e44a654f104ab9fb8e5d681a871159c73fcf3f666245e303387329b2
MD5 e3d628461d24faf2ad61e1305ed99542
SHA1 aefcdd93114397de51ce8f63e9ef96b65a5b5c11
SHA512 20d47ef82c1dde83325d088c69ff9ae6f968b0a19d652f5ed2f21b1531c86fbf0b49e9df0d524c1333001c7565a8a56039aa31bb82ceba63c41b989dc8fcc991
SSDEEP 49152:xvSlL26AaNeWgPhlmVqvMQ7XSK0bLimzCCoGdITHHB72eh2NT:xvKL26AaNeWgPhlmVqkQ7XSK0bLz
MD5 SHA1 SHA512 SSDEEP

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memory/1648-8-0x000007FEF5A50000-0x000007FEF643C000-memory.dmp

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memory/1648-9-0x0000000000AB0000-0x0000000000DD4000-memory.dmp

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memory/1648-11-0x000007FEF5A50000-0x000007FEF643C000-memory.dmp

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memory/1648-12-0x000007FEF5A50000-0x000007FEF643C000-memory.dmp

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memory/2864-0-0x000007FEF5A53000-0x000007FEF5A54000-memory.dmp

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memory/2864-1-0x0000000000D70000-0x0000000001094000-memory.dmp

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memory/2864-2-0x000007FEF5A50000-0x000007FEF643C000-memory.dmp

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memory/2864-10-0x000007FEF5A50000-0x000007FEF643C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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