quasar | 0d9fcb8894240750cb5e4222ea78572aba6618eb5297c2069588ceb979d52d8b

Resubmissions

13-07-2024 09:54

240713-lxcvgawdmn 10

13-07-2024 09:52

240713-lv46yawdkj 10

13-07-2024 09:46

240713-lrz3tayajc 10

Analysis

max time kernel
130s
max time network
146s
platform
windows10-2004_x64
resource
win10v2004-20240709-en
resource tags

arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
submitted
13-07-2024 09:46

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General

Target

680caf0e30b204544971d053b635ed0e3f1dee3332d9eab8a08b3f04cd7ecd75.exe
Size

439KB
MD5

8f808bb54b422500304dfc68b87198fc
SHA1

24ebeb615f0bdcaa3980722100d6fc42111b62ec
SHA256

680caf0e30b204544971d053b635ed0e3f1dee3332d9eab8a08b3f04cd7ecd75
SHA512

46ce4cde81607819e360b0efc424c4b5602c7515661a88e6a0d66cd9e88dcc68219f0a85200e6c40cc34bcac0e5ab652e6db4b4b1c1b913ad351061dae880e99
SSDEEP

6144:vwLRSjIXAnZQel5w7T4P5Kq+SMv0VGb7bDcllbkuVB8:v/4AZrg7g9zVGkllbko

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0.0

Botnet

Office04

67.213.221.18:7812

Mutex

KFoYp486ql6lO6U0qI

Attributes

encryption_key
OtItMK9boIZNOQTejUzg
install_name
Windows Security.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Update
subdirectory
Windows Services

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Roaming\Windows Security.exe	family_quasar
behavioral14/memory/4744-17-0x0000000000840000-0x000000000088E000-memory.dmp	family_quasar

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

680caf0e30b204544971d053b635ed0e3f1dee3332d9eab8a08b3f04cd7ecd75.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-384068567-2943195810-3631207890-1000\Control Panel\International\Geo\Nation	680caf0e30b204544971d053b635ed0e3f1dee3332d9eab8a08b3f04cd7ecd75.exe

Executes dropped EXE 2 IoCs

Processes:

Windows Security.exeWindows Security.exe

pid process

4744 Windows Security.exe
4952 Windows Security.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.

Processes:

flow ioc

11 ip-api.com
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

4848 schtasks.exe
3420 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Windows Security.exeWindows Security.exe

description pid process

Token: SeDebugPrivilege 4744 Windows Security.exe
Token: SeDebugPrivilege 4952 Windows Security.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Windows Security.exe

pid process

4952 Windows Security.exe

pid	process
4744	Windows Security.exe
4952	Windows Security.exe

flow	ioc
11	ip-api.com

pid	process
4848	schtasks.exe
3420	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	4744	Windows Security.exe
Token: SeDebugPrivilege	4952	Windows Security.exe

pid	process
4952	Windows Security.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

680caf0e30b204544971d053b635ed0e3f1dee3332d9eab8a08b3f04cd7ecd75.exeWindows Security.exeWindows Security.exe

description	pid	process	target process
PID 3524 wrote to memory of 4744	3524	680caf0e30b204544971d053b635ed0e3f1dee3332d9eab8a08b3f04cd7ecd75.exe	Windows Security.exe
PID 3524 wrote to memory of 4744	3524	680caf0e30b204544971d053b635ed0e3f1dee3332d9eab8a08b3f04cd7ecd75.exe	Windows Security.exe
PID 3524 wrote to memory of 4744	3524	680caf0e30b204544971d053b635ed0e3f1dee3332d9eab8a08b3f04cd7ecd75.exe	Windows Security.exe
PID 4744 wrote to memory of 3420	4744	Windows Security.exe	schtasks.exe
PID 4744 wrote to memory of 3420	4744	Windows Security.exe	schtasks.exe
PID 4744 wrote to memory of 3420	4744	Windows Security.exe	schtasks.exe
PID 4744 wrote to memory of 4952	4744	Windows Security.exe	Windows Security.exe
PID 4744 wrote to memory of 4952	4744	Windows Security.exe	Windows Security.exe
PID 4744 wrote to memory of 4952	4744	Windows Security.exe	Windows Security.exe
PID 4952 wrote to memory of 4848	4952	Windows Security.exe	schtasks.exe
PID 4952 wrote to memory of 4848	4952	Windows Security.exe	schtasks.exe
PID 4952 wrote to memory of 4848	4952	Windows Security.exe	schtasks.exe

C:\Users\Admin\AppData\Local\Temp\680caf0e30b204544971d053b635ed0e3f1dee3332d9eab8a08b3f04cd7ecd75.exe
"C:\Users\Admin\AppData\Local\Temp\680caf0e30b204544971d053b635ed0e3f1dee3332d9eab8a08b3f04cd7ecd75.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3524
- C:\Users\Admin\AppData\Roaming\Windows Security.exe
  "C:\Users\Admin\AppData\Roaming\Windows Security.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4744
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows Security.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3420
- - C:\Users\Admin\AppData\Roaming\Windows Services\Windows Security.exe
    "C:\Users\Admin\AppData\Roaming\Windows Services\Windows Security.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4952
  - - C:\Windows\SysWOW64\schtasks.exe
      "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows Services\Windows Security.exe" /rl HIGHEST /f
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:4848

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\Windows Security.exe.log

Filesize
1KB

MD5
10eab9c2684febb5327b6976f2047587

SHA1
a12ed54146a7f5c4c580416aecb899549712449e

SHA256
f49dbd55029bfbc15134f7c6a4f967d6c39142c63f2e8f1f8c78fab108a2c928

SHA512
7e5fd90fffae723bd0c662a90e0730b507805f072771ee673d1d8c262dbf60c8a03ba5fe088f699a97c2e886380de158b2ccd59ee62e3d012dd6dd14ea9d0e50

Download Submit
C:\Users\Admin\AppData\Roaming\Windows Security.exe

Filesize
289KB

MD5
9ed927a589ceb0eb1cd72036f72b65ac

SHA1
b48d9257d0c902736c897a4d0cdf430939ff47af

SHA256
ed1545bda10c94c007b0d75b7895d10548fa096ba1b984b519737dfc6f307f3a

SHA512
282871bd88691162e3aaa5f679049e991ecc3ea605fcb8a63eac284f93e2c499a7a36bae26f584675de5601fc72710eb464068f4d258bf7184cb1da2fe573675

Download Submit
memory/3524-0-0x0000000074DB2000-0x0000000074DB3000-memory.dmp

Filesize
4KB

Download
memory/3524-1-0x0000000074DB0000-0x0000000075361000-memory.dmp

Filesize
5.7MB

Download
memory/3524-2-0x0000000074DB0000-0x0000000075361000-memory.dmp

Filesize
5.7MB

Download
memory/3524-16-0x0000000074DB0000-0x0000000075361000-memory.dmp

Filesize
5.7MB

Download
memory/4744-21-0x0000000005320000-0x0000000005386000-memory.dmp

Filesize
408KB

Download
memory/4744-15-0x0000000071F8E000-0x0000000071F8F000-memory.dmp

Filesize
4KB

Download
memory/4744-19-0x0000000005280000-0x0000000005312000-memory.dmp

Filesize
584KB

Download
memory/4744-20-0x0000000071F80000-0x0000000072730000-memory.dmp

Filesize
7.7MB

Download
memory/4744-17-0x0000000000840000-0x000000000088E000-memory.dmp

Filesize
312KB

Download
memory/4744-22-0x0000000005F80000-0x0000000005F92000-memory.dmp

Filesize
72KB

Download
memory/4744-23-0x00000000064C0000-0x00000000064FC000-memory.dmp

Filesize
240KB

Download
memory/4744-18-0x0000000005790000-0x0000000005D34000-memory.dmp

Filesize
5.6MB

Download
memory/4744-31-0x0000000071F80000-0x0000000072730000-memory.dmp

Filesize
7.7MB

Download
memory/4952-32-0x0000000071F80000-0x0000000072730000-memory.dmp

Filesize
7.7MB

Download
memory/4952-33-0x0000000071F80000-0x0000000072730000-memory.dmp

Filesize
7.7MB

Download
memory/4952-35-0x00000000067F0000-0x00000000067FA000-memory.dmp

Filesize
40KB

Download
memory/4952-36-0x0000000071F80000-0x0000000072730000-memory.dmp

Filesize
7.7MB

Download
memory/4952-37-0x0000000071F80000-0x0000000072730000-memory.dmp

Filesize
7.7MB

Download