quasar | b4c7d51a2a3a7c21b5b8831cd1a8f835258f1145275ae30d0d2723d973f36b2c

Analysis

max time kernel
150s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20230220-en
resource tags

arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
submitted
04/03/2023, 16:20

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General

Target
YES.exe
Size 348KB
Sample230304-ts9mmsdf8w
SHA256 b4c7d51a2a3a7c21b5b8831cd1a8f835258f1145275ae30d0d2723d973f36b2c
MD5 7e7e61c5e810ab4b74f9635880068705
SHA1 1377d7b0f50e676f2654b600b76f8521d4928f16
SHA512 6504ad4b5fd2e6ab3e42d268c77deeb25d201f4d5242faf0089f8b42a413e9bfc57b5c90cf0dfa374fb4c5811b2f1ca4cbc6cf4d17848c406b3447ae07e16659
SSDEEP 3072:f6rt+8Hiefcu00MKpyDcsvduNjRmBT8WyK4gyJeGmoXod2USLETh8bB1ETefWY2t:fANHXf500MONJye/bBMvY2fXyG0LTZq
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

Office04

AZEE12x-21531.portmap.host:21531

Mutex

QSR_MUTEX_n0f6at7YDD5llBKKrq

Attributes

encryption_key
sD4bElP1qa1uvnbQiVsn
install_name
Protect.exe
log_directory
Logs
reconnect_delay
30
startup_key
MS Protect
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral2/memory/4004-133-0x0000000000DC0000-0x0000000000E1E000-memory.dmp	family_quasar
behavioral2/files/0x00040000000225e5-143.dat	family_quasar
behavioral2/files/0x00040000000225e5-145.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3084	Protect.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
15	ip-api.com

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

T1053

pid	Process
4672	schtasks.exe
112	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4004	YES.exe
Token: SeDebugPrivilege	3084	Protect.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 4004 wrote to memory of 4672	4004	YES.exe	85
PID 4004 wrote to memory of 4672	4004	YES.exe	85
PID 4004 wrote to memory of 4672	4004	YES.exe	85
PID 4004 wrote to memory of 3084	4004	YES.exe	87
PID 4004 wrote to memory of 3084	4004	YES.exe	87
PID 4004 wrote to memory of 3084	4004	YES.exe	87
PID 3084 wrote to memory of 112	3084	Protect.exe	88
PID 3084 wrote to memory of 112	3084	Protect.exe	88
PID 3084 wrote to memory of 112	3084	Protect.exe	88

C:\Users\Admin\AppData\Local\Temp\YES.exe
"C:\Users\Admin\AppData\Local\Temp\YES.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4004
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "MS Protect" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\YES.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:4672
- C:\Users\Admin\AppData\Roaming\SubDir\Protect.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Protect.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3084
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "MS Protect" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Protect.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:112

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

Protect.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Protect.exe
Size 348KB
SHA256 b4c7d51a2a3a7c21b5b8831cd1a8f835258f1145275ae30d0d2723d973f36b2c
MD5 7e7e61c5e810ab4b74f9635880068705
SHA1 1377d7b0f50e676f2654b600b76f8521d4928f16
SHA512 6504ad4b5fd2e6ab3e42d268c77deeb25d201f4d5242faf0089f8b42a413e9bfc57b5c90cf0dfa374fb4c5811b2f1ca4cbc6cf4d17848c406b3447ae07e16659
SSDEEP 3072:f6rt+8Hiefcu00MKpyDcsvduNjRmBT8WyK4gyJeGmoXod2USLETh8bB1ETefWY2t:fANHXf500MONJye/bBMvY2fXyG0LTZq
MD5 SHA1 SHA512 SSDEEP

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Protect.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Protect.exe
Size 348KB
SHA256 b4c7d51a2a3a7c21b5b8831cd1a8f835258f1145275ae30d0d2723d973f36b2c
MD5 7e7e61c5e810ab4b74f9635880068705
SHA1 1377d7b0f50e676f2654b600b76f8521d4928f16
SHA512 6504ad4b5fd2e6ab3e42d268c77deeb25d201f4d5242faf0089f8b42a413e9bfc57b5c90cf0dfa374fb4c5811b2f1ca4cbc6cf4d17848c406b3447ae07e16659
SSDEEP 3072:f6rt+8Hiefcu00MKpyDcsvduNjRmBT8WyK4gyJeGmoXod2USLETh8bB1ETefWY2t:fANHXf500MONJye/bBMvY2fXyG0LTZq
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/3084-146-0x0000000004D70000-0x0000000004D80000-memory.dmp

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memory/3084-147-0x0000000006420000-0x000000000642A000-memory.dmp

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memory/3084-148-0x0000000004D70000-0x0000000004D80000-memory.dmp

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memory/4004-133-0x0000000000DC0000-0x0000000000E1E000-memory.dmp

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memory/4004-134-0x0000000005DF0000-0x0000000006394000-memory.dmp

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memory/4004-135-0x00000000058E0000-0x0000000005972000-memory.dmp

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memory/4004-136-0x0000000005790000-0x00000000057A0000-memory.dmp

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memory/4004-137-0x0000000005840000-0x00000000058A6000-memory.dmp

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memory/4004-138-0x0000000006820000-0x0000000006832000-memory.dmp

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memory/4004-139-0x0000000006C40000-0x0000000006C7C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads