quasar | 2934474f4672a2c5edf3c1e32822100b486530b69be7bfc83824d6a3f18e8438

General

Target

Client-built.exe
Size

3.1MB
MD5

65f560332bf2182421fe64870a52f4b2
SHA1

f2379252646dd6af1518ea54837ec6e23cc5a174
SHA256

2934474f4672a2c5edf3c1e32822100b486530b69be7bfc83824d6a3f18e8438
SHA512

3d1dd205dfcc29faab31a1df3e800d35d09c9d184d39b83e508dd23e821574451f05e4119c22203978074a0304892322a8a38e4a2018bde2595f146094aea023
SSDEEP

49152:gvplW2p9agXI2PrlTnr4BZmFzeqEwaBxmcoGdTrTHHB72eh2NT:gvHW2p9agXI2PrlTnrmZmFzeBwuD

Score

10^/10

quasar os spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

os

C2

192.168.12.144:4782

2607:fb91:789:644:42e:9308:c1bf:5574:4782

192.168.12.1:4782

Mutex

ed5e9894-fa68-429b-af19-40423a5eb03e

Attributes

encryption_key
816786C17BE34740EBDD613A07ED84B7070346E5
install_name
system runtime enironment.exe
log_directory
Logs
reconnect_delay
3000
startup_key
system runtime environment
subdirectory
SubDir

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
behavioral2/memory/4808-1-0x0000000000C90000-0x0000000000FB4000-memory.dmp	family_quasar
C:\Program Files\SubDir\system runtime enironment.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

system runtime enironment.exe

pid process

2328 system runtime enironment.exe

pid	process
2328	system runtime enironment.exe

Drops file in Program Files directory 2 IoCs

Processes:

Client-built.exe

description	ioc	process
File created	C:\Program Files\SubDir\system runtime enironment.exe	Client-built.exe
File opened for modification	C:\Program Files\SubDir\system runtime enironment.exe	Client-built.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

Processes:

schtasks.exeschtasks.exe

pid process

936 schtasks.exe
2256 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exesystem runtime enironment.exe

description pid process

Token: SeDebugPrivilege 4808 Client-built.exe
Token: SeDebugPrivilege 2328 system runtime enironment.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

system runtime enironment.exe

pid process

2328 system runtime enironment.exe

pid	process
936	schtasks.exe
2256	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	4808	Client-built.exe
Token: SeDebugPrivilege	2328	system runtime enironment.exe

pid	process
2328	system runtime enironment.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-built.exesystem runtime enironment.exe

description	pid	process	target process
PID 4808 wrote to memory of 936	4808	Client-built.exe	schtasks.exe
PID 4808 wrote to memory of 936	4808	Client-built.exe	schtasks.exe
PID 4808 wrote to memory of 2328	4808	Client-built.exe	system runtime enironment.exe
PID 4808 wrote to memory of 2328	4808	Client-built.exe	system runtime enironment.exe
PID 2328 wrote to memory of 2256	2328	system runtime enironment.exe	schtasks.exe
PID 2328 wrote to memory of 2256	2328	system runtime enironment.exe	schtasks.exe

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 Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4808
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "system runtime environment" /sc ONLOGON /tr "C:\Program Files\SubDir\system runtime enironment.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:936
- C:\Program Files\SubDir\system runtime enironment.exe
  "C:\Program Files\SubDir\system runtime enironment.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2328
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "system runtime environment" /sc ONLOGON /tr "C:\Program Files\SubDir\system runtime enironment.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2256

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:\Program Files\SubDir\system runtime enironment.exe

Filesize
3.1MB

MD5
65f560332bf2182421fe64870a52f4b2

SHA1
f2379252646dd6af1518ea54837ec6e23cc5a174

SHA256
2934474f4672a2c5edf3c1e32822100b486530b69be7bfc83824d6a3f18e8438

SHA512
3d1dd205dfcc29faab31a1df3e800d35d09c9d184d39b83e508dd23e821574451f05e4119c22203978074a0304892322a8a38e4a2018bde2595f146094aea023

Download Submit
memory/2328-9-0x00007FFBE16B0000-0x00007FFBE2171000-memory.dmp

Filesize
10.8MB

Download
memory/2328-10-0x00007FFBE16B0000-0x00007FFBE2171000-memory.dmp

Filesize
10.8MB

Download
memory/2328-11-0x00000000025E0000-0x0000000002630000-memory.dmp

Filesize
320KB

Download
memory/2328-12-0x000000001B830000-0x000000001B8E2000-memory.dmp

Filesize
712KB

Download
memory/2328-13-0x00007FFBE16B0000-0x00007FFBE2171000-memory.dmp

Filesize
10.8MB

Download
memory/4808-0-0x00007FFBE16B3000-0x00007FFBE16B5000-memory.dmp

Filesize
8KB

Download
memory/4808-1-0x0000000000C90000-0x0000000000FB4000-memory.dmp

Filesize
3.1MB

Download
memory/4808-2-0x00007FFBE16B0000-0x00007FFBE2171000-memory.dmp

Filesize
10.8MB

Download
memory/4808-8-0x00007FFBE16B0000-0x00007FFBE2171000-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