quasar | 5ff90763b3dc2b9d39a1a70954e095554f905b27764bf4361d305488f5958fe9

General

Target

5ff90763b3dc2b9d39a1a70954e095554f905b27764bf4361d305488f5958fe9.exe
Size

4.7MB
MD5

9e6ea83b6175d0b34ccd0805a738329c
SHA1

a78c88d8c86a5bde4dafbd82de08cd3a95a9c610
SHA256

5ff90763b3dc2b9d39a1a70954e095554f905b27764bf4361d305488f5958fe9
SHA512

a7c2c28b180a24c3d4f13ad02cf13d5219d202f5842ff0a9c6f687387a248e43b393961d88609c2da4701d7d20da305fddc959c57faa62a2a30634ce66e4dca8
SSDEEP

98304:FXJdIUS/vr22SsaNYfdPBldt6+dBcjHtKRJ6BcIbzZBIbzZY:SrM7jGIfIK

Score

10^/10

quasar office04 discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

mx5.deitie.asia:4495

Mutex

ebbf737a-dddd-43dd-9b0a-74831302455d

Attributes

encryption_key
F8516D89A1DFD78BD8FF575BBC3AE828B47FF0E1
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
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/files/0x000d000000023b79-2.dat	family_quasar
behavioral2/memory/4832-5-0x0000000000290000-0x00000000005B4000-memory.dmp	family_quasar

Drops startup file 1 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe	5ff90763b3dc2b9d39a1a70954e095554f905b27764bf4361d305488f5958fe9.exe

Executes dropped EXE 2 IoCs

pid	Process
4832	sign.exe
628	Client.exe

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	5ff90763b3dc2b9d39a1a70954e095554f905b27764bf4361d305488f5958fe9.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
4056	schtasks.exe
3220	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3288	5ff90763b3dc2b9d39a1a70954e095554f905b27764bf4361d305488f5958fe9.exe
3288	5ff90763b3dc2b9d39a1a70954e095554f905b27764bf4361d305488f5958fe9.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4832	sign.exe
Token: SeDebugPrivilege	628	Client.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3288	5ff90763b3dc2b9d39a1a70954e095554f905b27764bf4361d305488f5958fe9.exe
3288	5ff90763b3dc2b9d39a1a70954e095554f905b27764bf4361d305488f5958fe9.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 3288 wrote to memory of 4832	3288	5ff90763b3dc2b9d39a1a70954e095554f905b27764bf4361d305488f5958fe9.exe	85
PID 3288 wrote to memory of 4832	3288	5ff90763b3dc2b9d39a1a70954e095554f905b27764bf4361d305488f5958fe9.exe	85
PID 4832 wrote to memory of 4056	4832	sign.exe	87
PID 4832 wrote to memory of 4056	4832	sign.exe	87
PID 4832 wrote to memory of 628	4832	sign.exe	89
PID 4832 wrote to memory of 628	4832	sign.exe	89
PID 628 wrote to memory of 3220	628	Client.exe	90
PID 628 wrote to memory of 3220	628	Client.exe	90

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\5ff90763b3dc2b9d39a1a70954e095554f905b27764bf4361d305488f5958fe9.exe
"C:\Users\Admin\AppData\Local\Temp\5ff90763b3dc2b9d39a1a70954e095554f905b27764bf4361d305488f5958fe9.exe"
1⤵
- Drops startup file
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3288
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\\sign.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4832
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4056
- - C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:628
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:3220

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 Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe

Filesize
3.1MB

MD5
7498d554976744dfbd271ba755c6c192

SHA1
ec733d01e776518e387d2f51d1a6559b81f03b1e

SHA256
44089202623b9671051aa5bba5e72f81f68ce818c3054dde57726aaa6dcb9ff7

SHA512
d4e987d0e6235001fac4ae3a634e8fe98c6830e26a6a6876fbc36262842688d3ec301cff75003d2af695cdfd357ac50919946695b7d5d3293ebcba97153e1030

Download Submit
memory/628-13-0x00007FF92B7C0000-0x00007FF92C281000-memory.dmp

Filesize
10.8MB

Download
memory/628-15-0x000000001AF30000-0x000000001AF80000-memory.dmp

Filesize
320KB

Download
memory/628-16-0x000000001B7D0000-0x000000001B882000-memory.dmp

Filesize
712KB

Download
memory/628-17-0x00007FF92B7C0000-0x00007FF92C281000-memory.dmp

Filesize
10.8MB

Download
memory/4832-4-0x00007FF92B7C3000-0x00007FF92B7C5000-memory.dmp

Filesize
8KB

Download
memory/4832-5-0x0000000000290000-0x00000000005B4000-memory.dmp

Filesize
3.1MB

Download
memory/4832-6-0x00007FF92B7C0000-0x00007FF92C281000-memory.dmp

Filesize
10.8MB

Download
memory/4832-14-0x00007FF92B7C0000-0x00007FF92C281000-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