quasar | 77c7a5365e87eb2bb21ab93df1c0c126c5eeac7d252b7a82ea3a0c3c72696d28

General

Target

Client-built.exe
Size

3.1MB
MD5

8e3d793135c7bbcd500a9898f9bf87f9
SHA1

c49bd760c70c65ae8c6988eb6e07e4d1e034b0d4
SHA256

77c7a5365e87eb2bb21ab93df1c0c126c5eeac7d252b7a82ea3a0c3c72696d28
SHA512

a64b7d682d78e1a268d8c0e6b0e323919687ca604ff6905aaac7af6184825c8389c57acdae653a8f3f09f71c672768ce2b0538eba5dc71eca42411cbfe9be7c1
SSDEEP

49152:LvzlL26AaNeWgPhlmVqvMQ7XSKtsRJ6vbR3LoGdXTHHB72eh2NT:LvpL26AaNeWgPhlmVqkQ7XSKtsRJ6B

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.31.81:4782

Mutex

eeab585f-b0d1-4116-86bf-2dd9d4212cc5

Attributes

encryption_key
554C6E8AB4C4203FCE94ABDFD5608449D2385C7B
install_name
WindowsSecurity.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Security Notifications
subdirectory
Windows Files

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/2332-1-0x0000000000EC0000-0x00000000011E4000-memory.dmp	family_quasar
behavioral1/files/0x0008000000016c4e-5.dat	family_quasar
behavioral1/memory/2388-10-0x0000000000B60000-0x0000000000E84000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2388	WindowsSecurity.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
2148	schtasks.exe
2736	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2332	Client-built.exe
Token: SeDebugPrivilege	2388	WindowsSecurity.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2388	WindowsSecurity.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2332 wrote to memory of 2148	2332	Client-built.exe	31
PID 2332 wrote to memory of 2148	2332	Client-built.exe	31
PID 2332 wrote to memory of 2148	2332	Client-built.exe	31
PID 2332 wrote to memory of 2388	2332	Client-built.exe	33
PID 2332 wrote to memory of 2388	2332	Client-built.exe	33
PID 2332 wrote to memory of 2388	2332	Client-built.exe	33
PID 2388 wrote to memory of 2736	2388	WindowsSecurity.exe	34
PID 2388 wrote to memory of 2736	2388	WindowsSecurity.exe	34
PID 2388 wrote to memory of 2736	2388	WindowsSecurity.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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2332
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Windows Security Notifications" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows Files\WindowsSecurity.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2148
- C:\Users\Admin\AppData\Roaming\Windows Files\WindowsSecurity.exe
  "C:\Users\Admin\AppData\Roaming\Windows Files\WindowsSecurity.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2388
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Windows Security Notifications" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows Files\WindowsSecurity.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2736

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Windows Files\WindowsSecurity.exe

Filesize
3.1MB

MD5
8e3d793135c7bbcd500a9898f9bf87f9

SHA1
c49bd760c70c65ae8c6988eb6e07e4d1e034b0d4

SHA256
77c7a5365e87eb2bb21ab93df1c0c126c5eeac7d252b7a82ea3a0c3c72696d28

SHA512
a64b7d682d78e1a268d8c0e6b0e323919687ca604ff6905aaac7af6184825c8389c57acdae653a8f3f09f71c672768ce2b0538eba5dc71eca42411cbfe9be7c1

Download Submit
memory/2332-0-0x000007FEF6723000-0x000007FEF6724000-memory.dmp

Filesize
4KB

Download
memory/2332-1-0x0000000000EC0000-0x00000000011E4000-memory.dmp

Filesize
3.1MB

Download
memory/2332-2-0x000007FEF6720000-0x000007FEF710C000-memory.dmp

Filesize
9.9MB

Download
memory/2332-8-0x000007FEF6720000-0x000007FEF710C000-memory.dmp

Filesize
9.9MB

Download
memory/2388-9-0x000007FEF6720000-0x000007FEF710C000-memory.dmp

Filesize
9.9MB

Download
memory/2388-10-0x0000000000B60000-0x0000000000E84000-memory.dmp

Filesize
3.1MB

Download
memory/2388-11-0x000007FEF6720000-0x000007FEF710C000-memory.dmp

Filesize
9.9MB

Download
memory/2388-12-0x000007FEF6720000-0x000007FEF710C000-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