quasar | 5b1365bd1c3648fdfe1aa9699e1647b3967bf3824c0b03eb4e67ef4599840135

Analysis

max time kernel
135s
max time network
155s
platform
windows10-2004_x64
resource
win10v2004-20230220-en
resource tags

arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
submitted
24/05/2023, 08:56

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General

Target

serviceupdate.exe
Size

4.4MB
MD5

e862112b0a3781dcf75eaf11b8b6ea7d
SHA1

725b9a18c2c6cdd616ad10d6f9e977753c7eb0e4
SHA256

5b1365bd1c3648fdfe1aa9699e1647b3967bf3824c0b03eb4e67ef4599840135
SHA512

6a5ebf286858e2a814fedf81fae111bd4468eaafe19ecc2a7eadf2d441b9584bab4ee4a3c5f83415d5cc31bbe11f7888e6dbe2a0a8a006affaefe463de3f535f
SSDEEP

98304:+4uKDZOjVXFcG7BEcyZeW+gP/i6jepIA90sK6LovYr5K49ZQ:+4uKDeFT7BEcyZpDP/RERXKsog5BHQ

Score

10^/10

quasar office04 persistence spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

microsoftbackup.duckdns.org:47600

Mutex

b97303a2-a8f5-4170-91c1-56adceee5081

Attributes

encryption_key
A31E078A7CC45D3676D5AE3FB460C3E365219397
install_name
Client.exe
log_directory
Log
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

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

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/3824-182-0x0000000000400000-0x0000000000724000-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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-144354903-2550862337-1367551827-1000\Control Panel\International\Geo\Nation	serviceupdate.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-144354903-2550862337-1367551827-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\serviceupdate = "\"C:\\Users\\Admin\\AppData\\Local\\Microsoft\\serviceupdate.exe\""	serviceupdate.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4672 set thread context of 3824	4672	serviceupdate.exe	100

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

System Information Discovery
T1082

Gathers network information 2 TTPs 2 IoCs

Uses commandline utility to view network configuration.

System Information Discovery

T1082

Command-Line Interface

T1059

pid	Process
4944	ipconfig.exe
5092	ipconfig.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4480	powershell.exe
4480	powershell.exe
4384	powershell.exe
4384	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	4672	serviceupdate.exe
Token: SeDebugPrivilege	4480	powershell.exe
Token: SeDebugPrivilege	4384	powershell.exe
Token: SeDebugPrivilege	3824	aspnet_compiler.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3824	aspnet_compiler.exe

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 4672 wrote to memory of 2040	4672	serviceupdate.exe	82
PID 4672 wrote to memory of 2040	4672	serviceupdate.exe	82
PID 4672 wrote to memory of 2040	4672	serviceupdate.exe	82
PID 2040 wrote to memory of 4944	2040	cmd.exe	84
PID 2040 wrote to memory of 4944	2040	cmd.exe	84
PID 2040 wrote to memory of 4944	2040	cmd.exe	84
PID 4672 wrote to memory of 4480	4672	serviceupdate.exe	85
PID 4672 wrote to memory of 4480	4672	serviceupdate.exe	85
PID 4672 wrote to memory of 4480	4672	serviceupdate.exe	85
PID 4672 wrote to memory of 2508	4672	serviceupdate.exe	94
PID 4672 wrote to memory of 2508	4672	serviceupdate.exe	94
PID 4672 wrote to memory of 2508	4672	serviceupdate.exe	94
PID 2508 wrote to memory of 4384	2508	cmd.exe	96
PID 2508 wrote to memory of 4384	2508	cmd.exe	96
PID 2508 wrote to memory of 4384	2508	cmd.exe	96
PID 4672 wrote to memory of 1736	4672	serviceupdate.exe	97
PID 4672 wrote to memory of 1736	4672	serviceupdate.exe	97
PID 4672 wrote to memory of 1736	4672	serviceupdate.exe	97
PID 1736 wrote to memory of 5092	1736	cmd.exe	99
PID 1736 wrote to memory of 5092	1736	cmd.exe	99
PID 1736 wrote to memory of 5092	1736	cmd.exe	99
PID 4672 wrote to memory of 3824	4672	serviceupdate.exe	100
PID 4672 wrote to memory of 3824	4672	serviceupdate.exe	100
PID 4672 wrote to memory of 3824	4672	serviceupdate.exe	100
PID 4672 wrote to memory of 3824	4672	serviceupdate.exe	100
PID 4672 wrote to memory of 3824	4672	serviceupdate.exe	100
PID 4672 wrote to memory of 3824	4672	serviceupdate.exe	100
PID 4672 wrote to memory of 3824	4672	serviceupdate.exe	100
PID 4672 wrote to memory of 3824	4672	serviceupdate.exe	100

C:\Users\Admin\AppData\Local\Temp\serviceupdate.exe
"C:\Users\Admin\AppData\Local\Temp\serviceupdate.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4672
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c ipconfig /release
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2040
- - C:\Windows\SysWOW64\ipconfig.exe
    ipconfig /release
    3⤵
    - Gathers network information
    PID:4944
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMwAyAA==
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4480
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c powershell -ENC cwBlAHQALQBtAHAAcAByAGUAZgBlAHIAZQBuAGMAZQAgAC0AZQB4AGMAbAB1AHMAaQBvAG4AcABhAHQAaAAgAEMAOgBcAA==
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2508
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    powershell -ENC cwBlAHQALQBtAHAAcAByAGUAZgBlAHIAZQBuAGMAZQAgAC0AZQB4AGMAbAB1AHMAaQBvAG4AcABhAHQAaAAgAEMAOgBcAA==
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4384
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c ipconfig /renew
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1736
- - C:\Windows\SysWOW64\ipconfig.exe
    ipconfig /renew
    3⤵
    - Gathers network information
    PID:5092
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
  C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:3824

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Command-Line Interface

T1059

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

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\powershell.exe.log

Filesize
1KB

MD5
4280e36a29fa31c01e4d8b2ba726a0d8

SHA1
c485c2c9ce0a99747b18d899b71dfa9a64dabe32

SHA256
e2486a1bdcba80dad6dd6210d7374bd70ae196a523c06ceda71370fd3ea78359

SHA512
494fe5f0ade03669e5830bed93c964d69b86629440148d7b0881cf53203fd89443ebff9b4d1ee9d96244f62af6edede622d9eacba37f80f389a0d522e4ad4ea4

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\ModuleAnalysisCache

Filesize
53KB

MD5
06ad34f9739c5159b4d92d702545bd49

SHA1
9152a0d4f153f3f40f7e606be75f81b582ee0c17

SHA256
474813b625f00710f29fa3b488235a6a22201851efb336bddf60d7d24a66bfba

SHA512
c272cd28ae164d465b779163ba9eca6a28261376414c6bbdfbd9f2128adb7f7ff1420e536b4d6000d0301ded2ec9036bc5c657588458bff41f176bdce8d74f92

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
16KB

MD5
9a30c54cd21774f8676aab3d604da105

SHA1
d3cf148ac222da6eb814ea23a944c53b9e7adde8

SHA256
86bd9d12e7ebd7b655e62161913fc065a5a2f3417b2c9af6c144a4dadc325ccf

SHA512
94d20aca4a6f889466de50b825ee2005a90dcc9913b4d165f116205cb73a5d005edd6317f07f62fbf7ba86a6c66d5136f99612df64bb969010e2fcc98d4aa4e9

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_4fe1yj2b.iuw.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/3824-211-0x0000000005850000-0x0000000005860000-memory.dmp

Filesize
64KB

Download
memory/3824-209-0x0000000006860000-0x0000000006872000-memory.dmp

Filesize
72KB

Download
memory/3824-210-0x00000000079D0000-0x0000000007A0C000-memory.dmp

Filesize
240KB

Download
memory/3824-205-0x0000000006890000-0x0000000006942000-memory.dmp

Filesize
712KB

Download
memory/3824-203-0x0000000006620000-0x0000000006670000-memory.dmp

Filesize
320KB

Download
memory/3824-202-0x0000000006AB0000-0x00000000070C8000-memory.dmp

Filesize
6.1MB

Download
memory/3824-197-0x0000000005850000-0x0000000005860000-memory.dmp

Filesize
64KB

Download
memory/3824-182-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/4384-200-0x0000000007A40000-0x0000000007A4A000-memory.dmp

Filesize
40KB

Download
memory/4384-201-0x0000000007C80000-0x0000000007D16000-memory.dmp

Filesize
600KB

Download
memory/4384-207-0x0000000007BE0000-0x0000000007BE8000-memory.dmp

Filesize
32KB

Download
memory/4384-206-0x0000000007C00000-0x0000000007C1A000-memory.dmp

Filesize
104KB

Download
memory/4384-204-0x0000000006520000-0x000000000652E000-memory.dmp

Filesize
56KB

Download
memory/4384-199-0x00000000030E0000-0x00000000030F0000-memory.dmp

Filesize
64KB

Download
memory/4384-198-0x000000007F000000-0x000000007F010000-memory.dmp

Filesize
64KB

Download
memory/4384-196-0x0000000006C60000-0x0000000006C7E000-memory.dmp

Filesize
120KB

Download
memory/4384-186-0x000000006FD20000-0x000000006FD6C000-memory.dmp

Filesize
304KB

Download
memory/4384-185-0x0000000006CA0000-0x0000000006CD2000-memory.dmp

Filesize
200KB

Download
memory/4384-181-0x00000000030E0000-0x00000000030F0000-memory.dmp

Filesize
64KB

Download
memory/4384-180-0x00000000030E0000-0x00000000030F0000-memory.dmp

Filesize
64KB

Download
memory/4480-157-0x0000000006020000-0x000000000603E000-memory.dmp

Filesize
120KB

Download
memory/4480-145-0x0000000005120000-0x0000000005748000-memory.dmp

Filesize
6.2MB

Download
memory/4480-144-0x0000000004AE0000-0x0000000004AF0000-memory.dmp

Filesize
64KB

Download
memory/4480-152-0x0000000005A00000-0x0000000005A66000-memory.dmp

Filesize
408KB

Download
memory/4480-164-0x0000000004AE0000-0x0000000004AF0000-memory.dmp

Filesize
64KB

Download
memory/4480-163-0x0000000004AE0000-0x0000000004AF0000-memory.dmp

Filesize
64KB

Download
memory/4480-143-0x0000000004AE0000-0x0000000004AF0000-memory.dmp

Filesize
64KB

Download
memory/4480-162-0x0000000004AE0000-0x0000000004AF0000-memory.dmp

Filesize
64KB

Download
memory/4480-158-0x0000000004AE0000-0x0000000004AF0000-memory.dmp

Filesize
64KB

Download
memory/4480-159-0x0000000007880000-0x0000000007EFA000-memory.dmp

Filesize
6.5MB

Download
memory/4480-160-0x0000000006520000-0x000000000653A000-memory.dmp

Filesize
104KB

Download
memory/4480-142-0x0000000004A90000-0x0000000004AC6000-memory.dmp

Filesize
216KB

Download
memory/4480-146-0x0000000005920000-0x0000000005986000-memory.dmp

Filesize
408KB

Download
memory/4672-141-0x0000000008940000-0x0000000008962000-memory.dmp

Filesize
136KB

Download
memory/4672-140-0x0000000005590000-0x000000000559A000-memory.dmp

Filesize
40KB

Download
memory/4672-161-0x0000000005560000-0x0000000005570000-memory.dmp

Filesize
64KB

Download
memory/4672-136-0x0000000000790000-0x0000000000BF4000-memory.dmp

Filesize
4.4MB

Download
memory/4672-139-0x0000000005560000-0x0000000005570000-memory.dmp

Filesize
64KB

Download
memory/4672-138-0x0000000005610000-0x00000000056A2000-memory.dmp

Filesize
584KB

Download
memory/4672-137-0x0000000005CB0000-0x0000000006254000-memory.dmp

Filesize
5.6MB

Download