quasar | b11faba7760b0fdb433ab416944a6c420db27216981aee61749f44bb51e61cb8

General

Target

Update.exe
Size

413KB
MD5

1646711c224bff90075c63e282c7a509
SHA1

dcb31c89ea750a0c7f201f0b35ec886d7f56b485
SHA256

b11faba7760b0fdb433ab416944a6c420db27216981aee61749f44bb51e61cb8
SHA512

826a1cf500ae1802bf55e5e73525e6a7c14a9e788c8e779291675b47e0a18424e49e369e39d3861b0e8491d230b5019c8db38632ee16f78a27fa8929c9d007df
SSDEEP

6144:aNmEjkzQT1TVNVSSL+4LuTWhDW3+y4WbjHSKr1MkP+7ZKvxueoLqGGe:i1TVV7ScaYS3vrHSKr1M85vxueoLlGe

Score

10^/10

quasar office04 discovery execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

3.1.5

Botnet

Office04

C2

late-mills.gl.at.ply.gg:21882

Mutex

$Sxr-H1UAIiBrogH7Kydvmf

Attributes

encryption_key
65yyFHEhMNxs2L9wZOfw
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
SeroXen Client Startup
subdirectory
SubDir

Signatures

Quasar RAT 3 IoCs

Quasar is an open source Remote Access Tool.

trojan spyware quasar

description	flow	ioc	Process
Key opened		\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Update.exe
	15	ip-api.com	Process not Found
	25	ip-api.com	Process not Found

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/3184-1-0x0000000000D50000-0x0000000000DBE000-memory.dmp	family_quasar
behavioral2/files/0x0008000000023cbe-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
764	powershell.exe
764	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
964	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
25	ip-api.com
15	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 7 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	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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Update.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.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
4592	ipconfig.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 3 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
4188	schtasks.exe
2972	SCHTASKS.exe
3800	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
764	powershell.exe
764	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3184	Update.exe
Token: SeDebugPrivilege	764	powershell.exe
Token: SeDebugPrivilege	964	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
964	Client.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 3184 wrote to memory of 4188	3184	Update.exe	88
PID 3184 wrote to memory of 4188	3184	Update.exe	88
PID 3184 wrote to memory of 4188	3184	Update.exe	88
PID 3184 wrote to memory of 964	3184	Update.exe	90
PID 3184 wrote to memory of 964	3184	Update.exe	90
PID 3184 wrote to memory of 964	3184	Update.exe	90
PID 3184 wrote to memory of 764	3184	Update.exe	91
PID 3184 wrote to memory of 764	3184	Update.exe	91
PID 3184 wrote to memory of 764	3184	Update.exe	91
PID 3184 wrote to memory of 4592	3184	Update.exe	93
PID 3184 wrote to memory of 4592	3184	Update.exe	93
PID 3184 wrote to memory of 4592	3184	Update.exe	93
PID 3184 wrote to memory of 2972	3184	Update.exe	95
PID 3184 wrote to memory of 2972	3184	Update.exe	95
PID 3184 wrote to memory of 2972	3184	Update.exe	95
PID 964 wrote to memory of 3800	964	Client.exe	97
PID 964 wrote to memory of 3800	964	Client.exe	97
PID 964 wrote to memory of 3800	964	Client.exe	97

C:\Users\Admin\AppData\Local\Temp\Update.exe
"C:\Users\Admin\AppData\Local\Temp\Update.exe"
1⤵
- Quasar RAT
- Drops file in Drivers directory
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3184
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "SeroXen Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Update.exe" /rl HIGHEST /f
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:4188
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:964
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "SeroXen Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3800
- 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:764
- C:\Windows\SysWOW64\ipconfig.exe
  "C:\Windows\System32\ipconfig.exe" /flushdns
  2⤵
  - System Location Discovery: System Language Discovery
  - Gathers network information
  PID:4592
- 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:2972

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

2

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

3

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_rg0bywbr.upw.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

Filesize
413KB

MD5
1646711c224bff90075c63e282c7a509

SHA1
dcb31c89ea750a0c7f201f0b35ec886d7f56b485

SHA256
b11faba7760b0fdb433ab416944a6c420db27216981aee61749f44bb51e61cb8

SHA512
826a1cf500ae1802bf55e5e73525e6a7c14a9e788c8e779291675b47e0a18424e49e369e39d3861b0e8491d230b5019c8db38632ee16f78a27fa8929c9d007df

Download Submit
memory/764-41-0x00000000719A0000-0x00000000719EC000-memory.dmp

Filesize
304KB

Download
memory/764-34-0x0000000006600000-0x000000000664C000-memory.dmp

Filesize
304KB

Download
memory/764-62-0x0000000074920000-0x00000000750D0000-memory.dmp

Filesize
7.7MB

Download
memory/764-59-0x0000000007C70000-0x0000000007C78000-memory.dmp

Filesize
32KB

Download
memory/764-58-0x0000000007C80000-0x0000000007C9A000-memory.dmp

Filesize
104KB

Download
memory/764-57-0x0000000007C40000-0x0000000007C54000-memory.dmp

Filesize
80KB

Download
memory/764-56-0x0000000007C30000-0x0000000007C3E000-memory.dmp

Filesize
56KB

Download
memory/764-55-0x0000000007BF0000-0x0000000007C01000-memory.dmp

Filesize
68KB

Download
memory/764-15-0x0000000002F50000-0x0000000002F86000-memory.dmp

Filesize
216KB

Download
memory/764-54-0x0000000007A80000-0x0000000007A8A000-memory.dmp

Filesize
40KB

Download
memory/764-17-0x0000000074920000-0x00000000750D0000-memory.dmp

Filesize
7.7MB

Download
memory/764-16-0x0000000005810000-0x0000000005E38000-memory.dmp

Filesize
6.2MB

Download
memory/764-18-0x0000000074920000-0x00000000750D0000-memory.dmp

Filesize
7.7MB

Download
memory/764-19-0x00000000056B0000-0x00000000056D2000-memory.dmp

Filesize
136KB

Download
memory/764-25-0x0000000005750000-0x00000000057B6000-memory.dmp

Filesize
408KB

Download
memory/764-53-0x00000000089C0000-0x000000000903A000-memory.dmp

Filesize
6.5MB

Download
memory/764-30-0x0000000005FA0000-0x00000000062F4000-memory.dmp

Filesize
3.3MB

Download
memory/764-52-0x0000000007900000-0x00000000079A3000-memory.dmp

Filesize
652KB

Download
memory/764-51-0x00000000078E0000-0x00000000078FE000-memory.dmp

Filesize
120KB

Download
memory/764-33-0x0000000006540000-0x000000000655E000-memory.dmp

Filesize
120KB

Download
memory/764-40-0x00000000078A0000-0x00000000078D2000-memory.dmp

Filesize
200KB

Download
memory/764-37-0x0000000007740000-0x00000000077D6000-memory.dmp

Filesize
600KB

Download
memory/764-38-0x0000000006A30000-0x0000000006A4A000-memory.dmp

Filesize
104KB

Download
memory/764-39-0x0000000006AA0000-0x0000000006AC2000-memory.dmp

Filesize
136KB

Download
memory/964-14-0x0000000074920000-0x00000000750D0000-memory.dmp

Filesize
7.7MB

Download
memory/964-63-0x0000000074920000-0x00000000750D0000-memory.dmp

Filesize
7.7MB

Download
memory/964-13-0x0000000074920000-0x00000000750D0000-memory.dmp

Filesize
7.7MB

Download
memory/964-36-0x0000000007020000-0x000000000702A000-memory.dmp

Filesize
40KB

Download
memory/3184-4-0x0000000074920000-0x00000000750D0000-memory.dmp

Filesize
7.7MB

Download
memory/3184-2-0x0000000005D00000-0x00000000062A4000-memory.dmp

Filesize
5.6MB

Download
memory/3184-1-0x0000000000D50000-0x0000000000DBE000-memory.dmp

Filesize
440KB

Download
memory/3184-7-0x0000000006A10000-0x0000000006A4C000-memory.dmp

Filesize
240KB

Download
memory/3184-32-0x0000000074920000-0x00000000750D0000-memory.dmp

Filesize
7.7MB

Download
memory/3184-6-0x00000000064D0000-0x00000000064E2000-memory.dmp

Filesize
72KB

Download
memory/3184-5-0x00000000057C0000-0x0000000005826000-memory.dmp

Filesize
408KB

Download
memory/3184-3-0x0000000005840000-0x00000000058D2000-memory.dmp

Filesize
584KB

Download
memory/3184-0-0x000000007492E000-0x000000007492F000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads