quasar | 444c97f6db0626069965d9e4ddb4bf315326954c51b123b3dc7d64084e7fb646

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
01/01/2025, 04:59

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General

Target

6d6c9c719e2f757442374af378c343a7.exe
Size

3.1MB
MD5

6d6c9c719e2f757442374af378c343a7
SHA1

a58a2aa6dae2dbdf64472614985cac2adce4eddb
SHA256

444c97f6db0626069965d9e4ddb4bf315326954c51b123b3dc7d64084e7fb646
SHA512

a3ef795e64b1d43ca300da97abc7d211e5987064c1c7cafa7a1dadcd1cb35902fb230f5b8e9a008ced4bc1d33573403bad2d99a4ccca9b6b749355110eb10210
SSDEEP

49152:HwElUPhZwv68DkG17WlqTz5oqM/p7vGJfAHdkTHHB72eh2NT:HwYUPhZwv68DkG17WlqTzeqM/p6t

Score

10^/10

quasar office04 defense_evasion spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.2

Botnet

Office04

193.31.28.181:4004

Mutex

704ccf6d-01bf-4037-a807-12a60509b1a4

Attributes

encryption_key
379B83B5AFE5908E0BC4583EBB5A83D7B76D2E00
install_name
Client.exe
log_directory
$77-Logs
reconnect_delay
3000
startup_key
$77-cmd
subdirectory
$77-cmd

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/3472-1-0x0000000000C90000-0x0000000000FB4000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023c96-9.dat	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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	6d6c9c719e2f757442374af378c343a7.exe

Executes dropped EXE 1 IoCs

pid	Process
1608	Client.exe

Indicator Removal: File Deletion 1 TTPs
Adversaries may delete files left behind by the actions of their intrusion activity.
defense_evasion

File Deletion
T1070.004
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Delays execution with timeout.exe 3 IoCs

evasion

pid	Process
3344	timeout.exe
3120	timeout.exe
348	timeout.exe

Modifies registry class 13 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\ms-settings\shell\open\command	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\ms-settings\shell\open\command\ = "C:\\Users\\Admin\\AppData\\Roaming\\$77-cmd\\Install.exe"	reg.exe
Key created	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\ms-settings\shell\open\command	reg.exe
Key created	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\ms-settings\shell\open\command	reg.exe
Key created	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\ms-settings\shell	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\ms-settings\shell\open\command\ = "C:\\Users\\Admin\\AppData\\Roaming\\$77-cmd\\Client.exe"	reg.exe
Key created	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\ms-settings\shell\open\command	reg.exe
Key deleted	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\ms-settings\shell\open\command	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\ms-settings\shell\open\command\DelegateExecute	reg.exe
Key created	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\ms-settings	reg.exe
Key created	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\ms-settings\shell\open	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\ms-settings\shell\open\command\DelegateExecute	reg.exe
Key deleted	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\ms-settings\shell\open\command	reg.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

pid	Process
3360	schtasks.exe
1756	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3472	6d6c9c719e2f757442374af378c343a7.exe
Token: SeDebugPrivilege	1608	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1608	Client.exe

Suspicious use of WriteProcessMemory 40 IoCs

description	pid	Process	procid_target
PID 3472 wrote to memory of 3360	3472	6d6c9c719e2f757442374af378c343a7.exe	83
PID 3472 wrote to memory of 3360	3472	6d6c9c719e2f757442374af378c343a7.exe	83
PID 3472 wrote to memory of 1868	3472	6d6c9c719e2f757442374af378c343a7.exe	85
PID 3472 wrote to memory of 1868	3472	6d6c9c719e2f757442374af378c343a7.exe	85
PID 1868 wrote to memory of 1196	1868	cmd.exe	87
PID 1868 wrote to memory of 1196	1868	cmd.exe	87
PID 1868 wrote to memory of 1552	1868	cmd.exe	88
PID 1868 wrote to memory of 1552	1868	cmd.exe	88
PID 1868 wrote to memory of 4216	1868	cmd.exe	89
PID 1868 wrote to memory of 4216	1868	cmd.exe	89
PID 1868 wrote to memory of 3344	1868	cmd.exe	90
PID 1868 wrote to memory of 3344	1868	cmd.exe	90
PID 4216 wrote to memory of 1608	4216	fodhelper.exe	91
PID 4216 wrote to memory of 1608	4216	fodhelper.exe	91
PID 1608 wrote to memory of 1756	1608	Client.exe	92
PID 1608 wrote to memory of 1756	1608	Client.exe	92
PID 1868 wrote to memory of 1864	1868	cmd.exe	94
PID 1868 wrote to memory of 1864	1868	cmd.exe	94
PID 1868 wrote to memory of 2372	1868	cmd.exe	95
PID 1868 wrote to memory of 2372	1868	cmd.exe	95
PID 3472 wrote to memory of 3316	3472	6d6c9c719e2f757442374af378c343a7.exe	97
PID 3472 wrote to memory of 3316	3472	6d6c9c719e2f757442374af378c343a7.exe	97
PID 3472 wrote to memory of 5080	3472	6d6c9c719e2f757442374af378c343a7.exe	99
PID 3472 wrote to memory of 5080	3472	6d6c9c719e2f757442374af378c343a7.exe	99
PID 3316 wrote to memory of 2252	3316	cmd.exe	101
PID 3316 wrote to memory of 2252	3316	cmd.exe	101
PID 3316 wrote to memory of 4048	3316	cmd.exe	102
PID 3316 wrote to memory of 4048	3316	cmd.exe	102
PID 5080 wrote to memory of 3120	5080	cmd.exe	103
PID 5080 wrote to memory of 3120	5080	cmd.exe	103
PID 3316 wrote to memory of 3648	3316	cmd.exe	104
PID 3316 wrote to memory of 3648	3316	cmd.exe	104
PID 3316 wrote to memory of 3976	3316	cmd.exe	105
PID 3316 wrote to memory of 3976	3316	cmd.exe	105
PID 3316 wrote to memory of 348	3316	cmd.exe	106
PID 3316 wrote to memory of 348	3316	cmd.exe	106
PID 3316 wrote to memory of 780	3316	cmd.exe	107
PID 3316 wrote to memory of 780	3316	cmd.exe	107
PID 3316 wrote to memory of 624	3316	cmd.exe	108
PID 3316 wrote to memory of 624	3316	cmd.exe	108

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\6d6c9c719e2f757442374af378c343a7.exe
"C:\Users\Admin\AppData\Local\Temp\6d6c9c719e2f757442374af378c343a7.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3472
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "$77-cmd" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\$77-cmd\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3360
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\$77-cmd\UACBypass1.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1868
- - C:\Windows\system32\reg.exe
    reg add "HKCU\Software\Classes\ms-settings\shell\open\command" /ve /d "C:\Users\Admin\AppData\Roaming\$77-cmd\Client.exe" /f
    3⤵
    - Modifies registry class
    PID:1196
- - C:\Windows\system32\reg.exe
    reg add "HKCU\Software\Classes\ms-settings\shell\open\command" /v "DelegateExecute" /f
    3⤵
    - Modifies registry class
    PID:1552
- - C:\Windows\system32\fodhelper.exe
    fodhelper.exe
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4216
  - - C:\Users\Admin\AppData\Roaming\$77-cmd\Client.exe
      "C:\Users\Admin\AppData\Roaming\$77-cmd\Client.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:1608
    - - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "$77-cmd" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\$77-cmd\Client.exe" /rl HIGHEST /f
        5⤵
        Scheduled Task/Job: Scheduled Task
        
        PID:1756
- - C:\Windows\system32\timeout.exe
    timeout /t 2 /nobreak
    3⤵
    - Delays execution with timeout.exe
    PID:3344
- - C:\Windows\system32\reg.exe
    reg delete "HKCU\Software\Classes\ms-settings\shell\open\command" /f
    3⤵
    - Modifies registry class
    PID:1864
- - C:\Windows\system32\cmd.exe
    cmd /c del "C:\Users\Admin\AppData\Roaming\$77-cmd\UACBypass1.bat"
    3⤵
    PID:2372
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\$77-cmd\UACBypass2.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3316
- - C:\Windows\system32\reg.exe
    reg delete "HKCU\Software\Classes\ms-settings\shell\open\command" /f
    3⤵
    PID:2252
- - C:\Windows\system32\reg.exe
    reg add "HKCU\Software\Classes\ms-settings\shell\open\command" /ve /d "C:\Users\Admin\AppData\Roaming\$77-cmd\Install.exe" /f
    3⤵
    - Modifies registry class
    PID:4048
- - C:\Windows\system32\reg.exe
    reg add "HKCU\Software\Classes\ms-settings\shell\open\command" /v "DelegateExecute" /f
    3⤵
    - Modifies registry class
    PID:3648
- - C:\Windows\system32\fodhelper.exe
    fodhelper.exe
    3⤵
    PID:3976
- - C:\Windows\system32\timeout.exe
    timeout /t 2 /nobreak
    3⤵
    - Delays execution with timeout.exe
    PID:348
- - C:\Windows\system32\reg.exe
    reg delete "HKCU\Software\Classes\ms-settings\shell\open\command" /f
    3⤵
    - Modifies registry class
    PID:780
- - C:\Windows\system32\cmd.exe
    cmd /c del "C:\Users\Admin\AppData\Roaming\$77-cmd\UACBypass2.bat"
    3⤵
    PID:624
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\$77-cmd\Melt.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:5080
- - C:\Windows\system32\timeout.exe
    timeout /t 5 /nobreak
    3⤵
    - Delays execution with timeout.exe
    PID:3120

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

Indicator Removal

T1070

File Deletion

T1070.004

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\$77-cmd\Client.exe

Filesize
3.1MB

MD5
6d6c9c719e2f757442374af378c343a7

SHA1
a58a2aa6dae2dbdf64472614985cac2adce4eddb

SHA256
444c97f6db0626069965d9e4ddb4bf315326954c51b123b3dc7d64084e7fb646

SHA512
a3ef795e64b1d43ca300da97abc7d211e5987064c1c7cafa7a1dadcd1cb35902fb230f5b8e9a008ced4bc1d33573403bad2d99a4ccca9b6b749355110eb10210

Download Submit
C:\Users\Admin\AppData\Roaming\$77-cmd\Melt.bat

Filesize
118B

MD5
de5e036a2f08f6ca6f6c501e906ee183

SHA1
a3c38b7d2ea31066d0bae492fb56649c22a73153

SHA256
d6c0337116e52ef3fb46fcab1ade26cf9538e47f892c362f5317de3dd98d27ae

SHA512
80ae4c5985b78fc2a74ab8946125f6a04ae8ca9102ad313fe543772a7aace610af1a8c17efaaadcbdad29cb1fa3170de632a984ec183e24fa7cdfeb81664c384

Download Submit
C:\Users\Admin\AppData\Roaming\$77-cmd\UACBypass1.bat

Filesize
368B

MD5
2c3953fd265ea1d97e348ff0a6daa80a

SHA1
f794d9fc87e3011b1b134b45a20a5a3b7762497c

SHA256
5b580991ef331e03c600f18fcdcae08763ee887c4ffa4d714244fa19dc762082

SHA512
7b442c0934db9aca25cbc2d5b6d84f762905837f60120bc083b83d4858e6c24dec5633db5dff89825435f67f2fde9c1de5bf05ec21c6e6851c3e2ec0e853dad0

Download Submit
C:\Users\Admin\AppData\Roaming\$77-cmd\UACBypass2.bat

Filesize
401B

MD5
8702552763fe86626d3cb6c766578cc8

SHA1
53f2b99da6b2e1edc557fd999801b8e768699da0

SHA256
e199e4c1f8ce95a86356655c6863bbdc0c4266bee73c872e97398419672ed626

SHA512
355063c41d254ad0675c36f535b84d4bf1c6d716dc785bcdd668edb53d76454d3b372bacfe0c382a38be2b813eb463545deed47bf724c3d6d4fd52aa129b79e3

Download Submit
memory/1608-11-0x000000001C3E0000-0x000000001C430000-memory.dmp

Filesize
320KB

Download
memory/1608-12-0x000000001C4F0000-0x000000001C5A2000-memory.dmp

Filesize
712KB

Download
memory/3472-0-0x00007FF940393000-0x00007FF940395000-memory.dmp

Filesize
8KB

Download
memory/3472-1-0x0000000000C90000-0x0000000000FB4000-memory.dmp

Filesize
3.1MB

Download
memory/3472-2-0x00007FF940390000-0x00007FF940E51000-memory.dmp

Filesize
10.8MB

Download
memory/3472-20-0x00007FF940390000-0x00007FF940E51000-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