quasar | adb07f246886c9b3923cb565463a66cc3e69f16982dd513669d09b5285ac5cfa

General

Target

VerifiedAssetLinked.exe
Size

3.2MB
MD5

e8ecf83250f2badd7aa0c240fdc7be04
SHA1

23081fbff25cb90abfaa3f6c80d3ae79dbaf6fdb
SHA256

adb07f246886c9b3923cb565463a66cc3e69f16982dd513669d09b5285ac5cfa
SHA512

aeebeb2f787303a8ea5594fd94e7c8002b8dd9eb6dd01bea001a6540c96954359d8fc2e4a596108256d197ef06bebca367900e388882e17ab134c2e8ec595140
SSDEEP

49152:uXMWUmXsmnc6gB5LCeVYc5qwKQaUW6KfR3kVmqEze6ylTfKb8ExP0abZAGU3uXfp:kzTc6gBFi6aL7i1serlrK10EpU3uW

Score

10^/10

quasar xworm office04 defense_evasion discovery rat spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

84.67.89.127:4782

Mutex

40b84850-9991-4b2c-a985-76db9b77d6fe

Attributes

encryption_key
24D2D4587F63E088D81748782350D3C2EF08E8BC
install_name
SystemRuntimes.exe
log_directory
Logs
reconnect_delay
3000
startup_key
DisplayRuntimes
subdirectory
SubDir

Extracted

Family

xworm

Version

5.0

C2

84.67.89.127:7000

Mutex

i0Qt3kYCfooW9ohR

Attributes

Install_directory
%AppData%
install_file
System.exe

aes.plain

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral1/files/0x0007000000019259-8.dat	family_xworm
behavioral1/memory/2584-10-0x00000000010C0000-0x00000000010D0000-memory.dmp	family_xworm

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral1/files/0x0007000000012118-5.dat	family_quasar
behavioral1/memory/2808-13-0x0000000000EB0000-0x00000000011D4000-memory.dmp	family_quasar
behavioral1/memory/2696-19-0x00000000013A0000-0x00000000016C4000-memory.dmp	family_quasar

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Xworm family
xworm

Executes dropped EXE 3 IoCs

pid	Process
2808	Qbuilt.exe
2584	XClient.exe
2696	SystemRuntimes.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.

flow	ioc
6	ip-api.com

Obfuscated Files or Information: Command Obfuscation 1 TTPs
Adversaries may obfuscate content during command execution to impede detection.
defense_evasion

Command Obfuscation
T1027.010

Drops file in System32 directory 5 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\SystemRuntimes.exe	Qbuilt.exe
File opened for modification	C:\Windows\system32\SubDir\SystemRuntimes.exe	Qbuilt.exe
File opened for modification	C:\Windows\system32\SubDir	Qbuilt.exe
File opened for modification	C:\Windows\system32\SubDir\SystemRuntimes.exe	SystemRuntimes.exe
File opened for modification	C:\Windows\system32\SubDir	SystemRuntimes.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\Qbuilt.exe	VerifiedAssetLinked.exe
File created	C:\Windows\XClient.exe	VerifiedAssetLinked.exe

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 2 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	VerifiedAssetLinked.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.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
2572	schtasks.exe
3044	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2776	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2584	XClient.exe
Token: SeDebugPrivilege	2808	Qbuilt.exe
Token: SeDebugPrivilege	2776	powershell.exe
Token: SeDebugPrivilege	2696	SystemRuntimes.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2696	SystemRuntimes.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2696	SystemRuntimes.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2696	SystemRuntimes.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2684 wrote to memory of 2776	2684	VerifiedAssetLinked.exe	30
PID 2684 wrote to memory of 2776	2684	VerifiedAssetLinked.exe	30
PID 2684 wrote to memory of 2776	2684	VerifiedAssetLinked.exe	30
PID 2684 wrote to memory of 2776	2684	VerifiedAssetLinked.exe	30
PID 2684 wrote to memory of 2808	2684	VerifiedAssetLinked.exe	32
PID 2684 wrote to memory of 2808	2684	VerifiedAssetLinked.exe	32
PID 2684 wrote to memory of 2808	2684	VerifiedAssetLinked.exe	32
PID 2684 wrote to memory of 2808	2684	VerifiedAssetLinked.exe	32
PID 2684 wrote to memory of 2584	2684	VerifiedAssetLinked.exe	33
PID 2684 wrote to memory of 2584	2684	VerifiedAssetLinked.exe	33
PID 2684 wrote to memory of 2584	2684	VerifiedAssetLinked.exe	33
PID 2684 wrote to memory of 2584	2684	VerifiedAssetLinked.exe	33
PID 2808 wrote to memory of 2572	2808	Qbuilt.exe	34
PID 2808 wrote to memory of 2572	2808	Qbuilt.exe	34
PID 2808 wrote to memory of 2572	2808	Qbuilt.exe	34
PID 2808 wrote to memory of 2696	2808	Qbuilt.exe	36
PID 2808 wrote to memory of 2696	2808	Qbuilt.exe	36
PID 2808 wrote to memory of 2696	2808	Qbuilt.exe	36
PID 2696 wrote to memory of 3044	2696	SystemRuntimes.exe	37
PID 2696 wrote to memory of 3044	2696	SystemRuntimes.exe	37
PID 2696 wrote to memory of 3044	2696	SystemRuntimes.exe	37

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\VerifiedAssetLinked.exe
"C:\Users\Admin\AppData\Local\Temp\VerifiedAssetLinked.exe"
1⤵
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2684
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "PAAjAG4AZQB6ACMAPgBBAGQAZAAtAE0AcABQAHIAZQBmAGUAcgBlAG4AYwBlACAAPAAjAHUAeABuACMAPgAgAC0ARQB4AGMAbAB1AHMAaQBvAG4AUABhAHQAaAAgAEAAKAAkAGUAbgB2ADoAVQBzAGUAcgBQAHIAbwBmAGkAbABlACwAJABlAG4AdgA6AFMAeQBzAHQAZQBtAEQAcgBpAHYAZQApACAAPAAjAHMAeAB6ACMAPgAgAC0ARgBvAHIAYwBlACAAPAAjAHMAeQB6ACMAPgA="
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2776
- C:\Windows\Qbuilt.exe
  "C:\Windows\Qbuilt.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2808
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "DisplayRuntimes" /sc ONLOGON /tr "C:\Windows\system32\SubDir\SystemRuntimes.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2572
- - C:\Windows\system32\SubDir\SystemRuntimes.exe
    "C:\Windows\system32\SubDir\SystemRuntimes.exe"
    3⤵
    - Executes dropped EXE
    - Drops file in System32 directory
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of FindShellTrayWindow
    - Suspicious use of SendNotifyMessage
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2696
  - - C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "DisplayRuntimes" /sc ONLOGON /tr "C:\Windows\system32\SubDir\SystemRuntimes.exe" /rl HIGHEST /f
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:3044
- C:\Windows\XClient.exe
  "C:\Windows\XClient.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2584

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

Obfuscated Files or Information

1

T1027

Command Obfuscation

1

T1027.010

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

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:\Windows\Qbuilt.exe

Filesize
3.1MB

MD5
548a6f6748f28b10a5e2f69f9c52fa43

SHA1
7466319907b51baca2b604144c0b7d021806da80

SHA256
e637549ded084cd9e61d64c46ef644362ccd60df698be34e3ebbec60a8a7d609

SHA512
25f26bba572e91f118dafc20248a77a891fc318b5aeb3b17971a6b06415de2b55a6f046eb012f0fa9501bf50957a91b53a70398586b533dc8d98dfcbed36fab4

Download Submit
C:\Windows\XClient.exe

Filesize
40KB

MD5
bbea771e6493ffdd10b1892669b8f696

SHA1
f0f2cccaf261fb7edd8be2368a612828d0a2e5da

SHA256
aa0e5674e5fff691be732265b5a6cc9b3eef63ce66e91e743306cf962f261fa3

SHA512
575c90bcf0530ad7474edfee922685d0c367b8d62ce677b87d66b2e3f4773d434eed44f83fa2ec698d19cb81f63d9f8dab09cf7d3c722e104450fb83ecbd2413

Download Submit
memory/2584-10-0x00000000010C0000-0x00000000010D0000-memory.dmp

Filesize
64KB

Download
memory/2696-19-0x00000000013A0000-0x00000000016C4000-memory.dmp

Filesize
3.1MB

Download
memory/2808-13-0x0000000000EB0000-0x00000000011D4000-memory.dmp

Filesize
3.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads