quasar | add949efc7c222e2a5c8189a56464384bd116eb05994f85891f1b57ecd570754

General

Target

Client-built.exe
Size

3.1MB
MD5

d5e34b544737c509d2c715befcf13bbe
SHA1

d32b3541f63a135cfb4cedda600641d34c4cb1ce
SHA256

add949efc7c222e2a5c8189a56464384bd116eb05994f85891f1b57ecd570754
SHA512

5f645abc822994f1615b7aa7c7e4a2dd3dc8c7d977792c82bf891629af65b81836d2c80268edcd2f80f798806744bfa09f6b2a08950d7c4e892e8ddc3a80e4e8
SSDEEP

49152:rvHI22SsaNYfdPBldt698dBcjHnBhETidKoGdVvTHHB72eh2NT:rvo22SsaNYfdPBldt6+dBcjHnB6Tis

Score

10^/10

quasar runtime broker spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Runtime Broker

C2

192.168.100.7:4449

Mutex

25995a9e-6e08-4214-8fe6-1aa44dc5c1d2

Attributes

encryption_key
B34E98F6CCC5FEAE5629334642BF27F516AF7D4F
install_name
Runtime Broker.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Runtime Broker
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/2704-1-0x0000000000C20000-0x0000000000F44000-memory.dmp	family_quasar
behavioral2/files/0x00070000000235be-7.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3080	Runtime Broker.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\Runtime Broker.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Runtime Broker.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Runtime Broker.exe	Runtime Broker.exe
File opened for modification	C:\Windows\system32\SubDir	Runtime Broker.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
4116	schtasks.exe
2852	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2704	Client-built.exe
Token: SeDebugPrivilege	3080	Runtime Broker.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3080	Runtime Broker.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2704 wrote to memory of 4116	2704	Client-built.exe	91
PID 2704 wrote to memory of 4116	2704	Client-built.exe	91
PID 2704 wrote to memory of 3080	2704	Client-built.exe	94
PID 2704 wrote to memory of 3080	2704	Client-built.exe	94
PID 3080 wrote to memory of 2852	3080	Runtime Broker.exe	97
PID 3080 wrote to memory of 2852	3080	Runtime Broker.exe	97

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:2704
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Runtime Broker" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Runtime Broker.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:4116
- C:\Windows\system32\SubDir\Runtime Broker.exe
  "C:\Windows\system32\SubDir\Runtime Broker.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3080
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Runtime Broker" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Runtime Broker.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2852

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=3772,i,11746347647270949551,7786733067759450703,262144 --variations-seed-version --mojo-platform-channel-handle=1268 /prefetch:8
1⤵
PID:3324

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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Downloads

C:\Windows\system32\SubDir\Runtime Broker.exe

Filesize
3.1MB

MD5
d5e34b544737c509d2c715befcf13bbe

SHA1
d32b3541f63a135cfb4cedda600641d34c4cb1ce

SHA256
add949efc7c222e2a5c8189a56464384bd116eb05994f85891f1b57ecd570754

SHA512
5f645abc822994f1615b7aa7c7e4a2dd3dc8c7d977792c82bf891629af65b81836d2c80268edcd2f80f798806744bfa09f6b2a08950d7c4e892e8ddc3a80e4e8

Download Submit
memory/2704-0-0x00007FF9922D3000-0x00007FF9922D5000-memory.dmp

Filesize
8KB

Download
memory/2704-1-0x0000000000C20000-0x0000000000F44000-memory.dmp

Filesize
3.1MB

Download
memory/2704-2-0x00007FF9922D0000-0x00007FF992D91000-memory.dmp

Filesize
10.8MB

Download
memory/2704-10-0x00007FF9922D0000-0x00007FF992D91000-memory.dmp

Filesize
10.8MB

Download
memory/3080-9-0x00007FF9922D0000-0x00007FF992D91000-memory.dmp

Filesize
10.8MB

Download
memory/3080-11-0x00007FF9922D0000-0x00007FF992D91000-memory.dmp

Filesize
10.8MB

Download
memory/3080-12-0x000000001D360000-0x000000001D3B0000-memory.dmp

Filesize
320KB

Download
memory/3080-13-0x000000001D470000-0x000000001D522000-memory.dmp

Filesize
712KB

Download
memory/3080-14-0x00007FF9922D0000-0x00007FF992D91000-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