quasar | e5963a8de3d81aff5bd3193d5137baa1b9022d6106dc3141f4d99c14e2fbad7e

General

Target

Client-built.exe
Size

3.1MB
MD5

c17ff0333852bb47c256d3a448910271
SHA1

be09b580de7608f2f1e9013bd16ad5499faf2ce3
SHA256

e5963a8de3d81aff5bd3193d5137baa1b9022d6106dc3141f4d99c14e2fbad7e
SHA512

1bf1840de9a7547fef877e0986c4a71c0360ea9005a3f85b98836596acc713e6d9764fd9c0a0d7356b0621cb278ec403bf7ac71f8155decb046d14ec4ecd13f5
SSDEEP

49152:rvClL26AaNeWgPhlmVqvMQ7XSK7pDGjHmzMVoGdBHTHHB72eh2NT:rv6L26AaNeWgPhlmVqkQ7XSKdDGjN

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

answer-patients.gl.at.ply.gg:4538

Mutex

bd9cc66c-344e-4ad2-b846-b59ac86aa18e

Attributes

encryption_key
9672EF6F385B517A0E912363D30D7BF6BDEA77A6
install_name
siema.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
svhost.gg

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral3/memory/1616-1-0x0000000000C60000-0x0000000000F84000-memory.dmp	family_quasar
behavioral3/files/0x001c00000002aa9e-7.dat	family_quasar

Executes dropped EXE 1 IoCs

Processes:

siema.exe

pid	Process
3216	siema.exe

Drops file in System32 directory 2 IoCs

Processes:

Client-built.exe

description	ioc	Process
File created	C:\Windows\system32\svhost.gg\siema.exe	Client-built.exe
File opened for modification	C:\Windows\system32\svhost.gg\siema.exe	Client-built.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

Processes:

schtasks.exeschtasks.exe

pid	Process
2752	schtasks.exe
1568	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exesiema.exe

description	pid	Process
Token: SeDebugPrivilege	1616	Client-built.exe
Token: SeDebugPrivilege	3216	siema.exe

Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

siema.exe

pid	Process
3216	siema.exe
3216	siema.exe

Suspicious use of SendNotifyMessage 2 IoCs

Processes:

siema.exe

pid	Process
3216	siema.exe
3216	siema.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

siema.exe

pid	Process
3216	siema.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-built.exesiema.exe

description	pid	Process	procid_target
PID 1616 wrote to memory of 2752	1616	Client-built.exe	77
PID 1616 wrote to memory of 2752	1616	Client-built.exe	77
PID 1616 wrote to memory of 3216	1616	Client-built.exe	79
PID 1616 wrote to memory of 3216	1616	Client-built.exe	79
PID 3216 wrote to memory of 1568	3216	siema.exe	80
PID 3216 wrote to memory of 1568	3216	siema.exe	80

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⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1616
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\svhost.gg\siema.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2752
- C:\Windows\system32\svhost.gg\siema.exe
  "C:\Windows\system32\svhost.gg\siema.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:3216
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\svhost.gg\siema.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1568

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:\Windows\system32\svhost.gg\siema.exe

Filesize
3.1MB

MD5
c17ff0333852bb47c256d3a448910271

SHA1
be09b580de7608f2f1e9013bd16ad5499faf2ce3

SHA256
e5963a8de3d81aff5bd3193d5137baa1b9022d6106dc3141f4d99c14e2fbad7e

SHA512
1bf1840de9a7547fef877e0986c4a71c0360ea9005a3f85b98836596acc713e6d9764fd9c0a0d7356b0621cb278ec403bf7ac71f8155decb046d14ec4ecd13f5

Download Submit
memory/1616-0-0x00007FF996B93000-0x00007FF996B95000-memory.dmp

Filesize
8KB

Download
memory/1616-1-0x0000000000C60000-0x0000000000F84000-memory.dmp

Filesize
3.1MB

Download
memory/1616-2-0x00007FF996B90000-0x00007FF997652000-memory.dmp

Filesize
10.8MB

Download
memory/1616-9-0x00007FF996B90000-0x00007FF997652000-memory.dmp

Filesize
10.8MB

Download
memory/3216-8-0x00007FF996B90000-0x00007FF997652000-memory.dmp

Filesize
10.8MB

Download
memory/3216-10-0x00007FF996B90000-0x00007FF997652000-memory.dmp

Filesize
10.8MB

Download
memory/3216-11-0x000000001BBC0000-0x000000001BC10000-memory.dmp

Filesize
320KB

Download
memory/3216-12-0x000000001BCD0000-0x000000001BD82000-memory.dmp

Filesize
712KB

Download
memory/3216-13-0x00007FF996B90000-0x00007FF997652000-memory.dmp

Filesize
10.8MB

Download
memory/3216-16-0x000000001BC60000-0x000000001BC72000-memory.dmp

Filesize
72KB

Download
memory/3216-17-0x000000001C9E0000-0x000000001CA1C000-memory.dmp

Filesize
240KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads