quasar | 45259ac5a1fd635f5b2a41492f4156cc8476afd8e8764a9d61d3158599a75fd8

Analysis

max time kernel
300s
max time network
307s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
02/06/2024, 18:08

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General

Target
Client-built.exe
Size 348KB
Sample240602-wrdjxsbb73
SHA256 45259ac5a1fd635f5b2a41492f4156cc8476afd8e8764a9d61d3158599a75fd8
MD5 3f99cb13866f63a572bfc49f56e49a21
SHA1 e968e6c46296389f04660d6811298025a5eef76f
SHA512 042bca3a560803e9e3a1704a92278bbb63ffa3c7b7217eb7602a3c0a5b14d4ad71adb92423e937276df4f1e0a31c6c1ab51ef922e2c3d6ded9cded185edbffb2
SSDEEP 6144:ecEHwNHJsa2x0Kx4IKhIBbIVhpXZVn/DOxpxnKACXsK:nxpsalT5XVhpXHrOxrnLcsK
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar client spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

Client

runderscore00-61208.portmap.host:61208

Mutex

QSR_MUTEX_UyCo16EyzQLUNZiVH0

Attributes

encryption_key
AaATXyVYZ9AKtrWxhyCz
install_name
Client.exe
log_directory
Keylogs
reconnect_delay
3000
startup_key
Powershell
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/2112-1-0x0000000000650000-0x00000000006AE000-memory.dmp	family_quasar
behavioral2/files/0x0008000000023261-11.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4472	Client.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
20	ip-api.com

Creates scheduled task(s) 1 TTPs 2 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
2760	schtasks.exe
3436	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2112	Client-built.exe
Token: SeDebugPrivilege	4472	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4472	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2112 wrote to memory of 2760	2112	Client-built.exe	94
PID 2112 wrote to memory of 2760	2112	Client-built.exe	94
PID 2112 wrote to memory of 2760	2112	Client-built.exe	94
PID 2112 wrote to memory of 4472	2112	Client-built.exe	96
PID 2112 wrote to memory of 4472	2112	Client-built.exe	96
PID 2112 wrote to memory of 4472	2112	Client-built.exe	96
PID 4472 wrote to memory of 3436	4472	Client.exe	98
PID 4472 wrote to memory of 3436	4472	Client.exe	98
PID 4472 wrote to memory of 3436	4472	Client.exe	98

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2112
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "Powershell" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:2760
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4472
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Powershell" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:3436

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1408 --field-trial-handle=2676,i,447940133669489189,1353734109898858672,262144 --variations-seed-version /prefetch:8
1⤵
PID:4592

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

Client.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Size 348KB
SHA256 45259ac5a1fd635f5b2a41492f4156cc8476afd8e8764a9d61d3158599a75fd8
MD5 3f99cb13866f63a572bfc49f56e49a21
SHA1 e968e6c46296389f04660d6811298025a5eef76f
SHA512 042bca3a560803e9e3a1704a92278bbb63ffa3c7b7217eb7602a3c0a5b14d4ad71adb92423e937276df4f1e0a31c6c1ab51ef922e2c3d6ded9cded185edbffb2
SSDEEP 6144:ecEHwNHJsa2x0Kx4IKhIBbIVhpXZVn/DOxpxnKACXsK:nxpsalT5XVhpXHrOxrnLcsK
MD5 SHA1 SHA512 SSDEEP

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memory/2112-6-0x00000000061D0000-0x00000000061E2000-memory.dmp

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memory/2112-2-0x0000000005640000-0x0000000005BE4000-memory.dmp

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memory/2112-3-0x00000000051C0000-0x0000000005252000-memory.dmp

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memory/2112-4-0x00000000753B0000-0x0000000075B60000-memory.dmp

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memory/2112-5-0x00000000054D0000-0x0000000005536000-memory.dmp

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memory/2112-0-0x00000000753BE000-0x00000000753BF000-memory.dmp

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memory/2112-7-0x0000000006610000-0x000000000664C000-memory.dmp

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memory/2112-1-0x0000000000650000-0x00000000006AE000-memory.dmp

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memory/2112-16-0x00000000753B0000-0x0000000075B60000-memory.dmp

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memory/4472-14-0x00000000753B0000-0x0000000075B60000-memory.dmp

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memory/4472-15-0x00000000753B0000-0x0000000075B60000-memory.dmp

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memory/4472-18-0x0000000006FF0000-0x0000000006FFA000-memory.dmp

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memory/4472-19-0x00000000753B0000-0x0000000075B60000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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