quasar | 926ca6246cafb2f73a2a44325a1c2c9a5e136f109cf5fc1beecfe2611adc95e8

Analysis

max time kernel
34s
max time network
38s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
17/01/2025, 20:54

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General

Target

Update.exe
Size

413KB
MD5

d0564fc7770410d9c9efddfe4318fe40
SHA1

70e9c65c95ef79a8fb412d4b5baa747be19f358f
SHA256

926ca6246cafb2f73a2a44325a1c2c9a5e136f109cf5fc1beecfe2611adc95e8
SHA512

0dbad5c423b060dc3122c8b1d351e6fd519526de74ff01c17997e05ec88b91cb2c9e9267ed406f0f652cd82c788318ca671e7bf6fc6b4b810f780a04521bc37d
SSDEEP

12288:t1TVVfbfGyO2NHb64vVEWiFjwqLlShatH1GK:9NeyO2NHb64vVEZjbLlS0D

Score

10^/10

quasar office04 discovery execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

3.1.5

Botnet

Office04

217.254.98.158:4782

Mutex

$Sxr-0AJKEcQg2SeZyXPT01

Attributes

encryption_key
YCpmQrQIUT3FKePhT9Ax
install_name
rat_client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
SeroXen Client Startup
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral1/memory/3552-1-0x00000000001C0000-0x000000000022E000-memory.dmp	family_quasar
behavioral1/files/0x0007000000023cac-10.dat	family_quasar

Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
384	powershell.exe
384	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\drivers\etc\hosts	Update.exe

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-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	Update.exe

Executes dropped EXE 1 IoCs

pid	Process
2928	rat_client.exe

Looks up external IP address via web service 2 IoCs

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

flow	ioc
13	ip-api.com
18	ip-api.com

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rat_client.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ipconfig.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	SCHTASKS.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Update.exe

Gathers network information 2 TTPs 1 IoCs

Uses commandline utility to view network configuration.

System Information Discovery

T1082

Command and Scripting Interpreter

T1059

pid	Process
8	ipconfig.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
4224	SCHTASKS.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
384	powershell.exe
384	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3552	Update.exe
Token: SeDebugPrivilege	384	powershell.exe
Token: SeDebugPrivilege	2928	rat_client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2928	rat_client.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 3552 wrote to memory of 2928	3552	Update.exe	85
PID 3552 wrote to memory of 2928	3552	Update.exe	85
PID 3552 wrote to memory of 2928	3552	Update.exe	85
PID 3552 wrote to memory of 384	3552	Update.exe	86
PID 3552 wrote to memory of 384	3552	Update.exe	86
PID 3552 wrote to memory of 384	3552	Update.exe	86
PID 3552 wrote to memory of 8	3552	Update.exe	88
PID 3552 wrote to memory of 8	3552	Update.exe	88
PID 3552 wrote to memory of 8	3552	Update.exe	88
PID 3552 wrote to memory of 4224	3552	Update.exe	90
PID 3552 wrote to memory of 4224	3552	Update.exe	90
PID 3552 wrote to memory of 4224	3552	Update.exe	90

C:\Users\Admin\AppData\Local\Temp\Update.exe
"C:\Users\Admin\AppData\Local\Temp\Update.exe"
1⤵
- Drops file in Drivers directory
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3552
- C:\Users\Admin\AppData\Roaming\SubDir\rat_client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\rat_client.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:2928
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" -WindowStyle Hidden -Command "Add-MpPreference -ExclusionPath (Get-Item -LiteralPath $env:SystemRoot).Root"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:384
- C:\Windows\SysWOW64\ipconfig.exe
  "C:\Windows\System32\ipconfig.exe" /flushdns
  2⤵
  - System Location Discovery: System Language Discovery
  - Gathers network information
  PID:8
- C:\Windows\SysWOW64\SCHTASKS.exe
  "SCHTASKS.exe" /create /tn "$77Update.exe" /tr "'C:\Users\Admin\AppData\Local\Temp\Update.exe'" /sc onlogon /rl HIGHEST
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:4224

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

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

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_xklkxrd3.ih5.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\rat_client.exe

Filesize
413KB

MD5
d0564fc7770410d9c9efddfe4318fe40

SHA1
70e9c65c95ef79a8fb412d4b5baa747be19f358f

SHA256
926ca6246cafb2f73a2a44325a1c2c9a5e136f109cf5fc1beecfe2611adc95e8

SHA512
0dbad5c423b060dc3122c8b1d351e6fd519526de74ff01c17997e05ec88b91cb2c9e9267ed406f0f652cd82c788318ca671e7bf6fc6b4b810f780a04521bc37d

Download Submit
memory/384-16-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download
memory/384-41-0x00000000075D0000-0x0000000007602000-memory.dmp

Filesize
200KB

Download
memory/384-58-0x0000000008120000-0x0000000008134000-memory.dmp

Filesize
80KB

Download
memory/384-57-0x0000000008110000-0x000000000811E000-memory.dmp

Filesize
56KB

Download
memory/384-56-0x00000000080D0000-0x00000000080E1000-memory.dmp

Filesize
68KB

Download
memory/384-55-0x00000000079B0000-0x00000000079BA000-memory.dmp

Filesize
40KB

Download
memory/384-60-0x0000000008150000-0x0000000008158000-memory.dmp

Filesize
32KB

Download
memory/384-54-0x0000000008730000-0x0000000008DAA000-memory.dmp

Filesize
6.5MB

Download
memory/384-53-0x0000000007810000-0x00000000078B3000-memory.dmp

Filesize
652KB

Download
memory/384-15-0x0000000004ED0000-0x0000000004F06000-memory.dmp

Filesize
216KB

Download
memory/384-42-0x0000000071700000-0x000000007174C000-memory.dmp

Filesize
304KB

Download
memory/384-17-0x0000000005540000-0x0000000005B68000-memory.dmp

Filesize
6.2MB

Download
memory/384-59-0x0000000008160000-0x000000000817A000-memory.dmp

Filesize
104KB

Download
memory/384-63-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download
memory/384-18-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download
memory/384-25-0x0000000005CE0000-0x0000000005D02000-memory.dmp

Filesize
136KB

Download
memory/384-27-0x0000000005E80000-0x0000000005EE6000-memory.dmp

Filesize
408KB

Download
memory/384-31-0x0000000005FB0000-0x0000000006304000-memory.dmp

Filesize
3.3MB

Download
memory/384-52-0x00000000075B0000-0x00000000075CE000-memory.dmp

Filesize
120KB

Download
memory/384-34-0x0000000006490000-0x00000000064AE000-memory.dmp

Filesize
120KB

Download
memory/384-35-0x00000000069B0000-0x00000000069FC000-memory.dmp

Filesize
304KB

Download
memory/384-19-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download
memory/384-38-0x00000000074B0000-0x0000000007546000-memory.dmp

Filesize
600KB

Download
memory/384-39-0x00000000068E0000-0x00000000068FA000-memory.dmp

Filesize
104KB

Download
memory/384-40-0x0000000006950000-0x0000000006972000-memory.dmp

Filesize
136KB

Download
memory/2928-14-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download
memory/2928-37-0x0000000006740000-0x000000000674A000-memory.dmp

Filesize
40KB

Download
memory/2928-13-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download
memory/2928-64-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download
memory/3552-33-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download
memory/3552-0-0x000000007468E000-0x000000007468F000-memory.dmp

Filesize
4KB

Download
memory/3552-7-0x0000000005E90000-0x0000000005ECC000-memory.dmp

Filesize
240KB

Download
memory/3552-6-0x0000000005190000-0x00000000051A2000-memory.dmp

Filesize
72KB

Download
memory/3552-5-0x0000000004DC0000-0x0000000004E26000-memory.dmp

Filesize
408KB

Download
memory/3552-4-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download
memory/3552-3-0x0000000004CB0000-0x0000000004D42000-memory.dmp

Filesize
584KB

Download
memory/3552-2-0x00000000051C0000-0x0000000005764000-memory.dmp

Filesize
5.6MB

Download
memory/3552-1-0x00000000001C0000-0x000000000022E000-memory.dmp

Filesize
440KB

Download