quasar | 3b91d7f0be55606bcdf71b37a18f34c298156b12181ff7c944fb7a1818916736

General

Target

3b91d7f0be55606bcdf71b37a18f34c298156b12181ff7c944fb7a1818916736N.exe
Size

7.6MB
MD5

2b0f4ed458655cb0dbc66cf2a1f6a650
SHA1

905121961d59b36a8eba46b02dcf9b48c68baae4
SHA256

3b91d7f0be55606bcdf71b37a18f34c298156b12181ff7c944fb7a1818916736
SHA512

1741a6881e9e9a24e8f4e50ee28dd9a00e47156ae987c4bd25348504dd669e2bd4f6685607275419dc7af42bbaa0ff53306a91bad892c2a508797a8fe9740fad
SSDEEP

196608:IiyGR6yx+w3u7zPJKqCyBDpQyNCD+l7ggmdzrK:IiHR6yx5uJKqCyfnNCigPZO

Score

10^/10

quasar new discovery spyware trojan upx

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

new

C2

caidume1368.ddns.net:8848

Mutex

QSR_MUTEX_7rJKh7823LOXhq62Ll

Attributes

encryption_key
XOrsMOPj48itZ7EYR3g9
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
System
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral1/files/0x0008000000018725-3.dat	family_quasar
behavioral1/memory/2868-40-0x0000000000E40000-0x0000000000E9E000-memory.dmp	family_quasar

Executes dropped EXE 4 IoCs

pid	Process
2868	Client-built.exe
2420	Built.exe
2676	Built.exe
1264	Process not Found

Loads dropped DLL 5 IoCs

pid	Process
792	3b91d7f0be55606bcdf71b37a18f34c298156b12181ff7c944fb7a1818916736N.exe
792	3b91d7f0be55606bcdf71b37a18f34c298156b12181ff7c944fb7a1818916736N.exe
2420	Built.exe
2676	Built.exe
1264	Process not Found

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
2	ip-api.com

UPX packed file 2 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral1/files/0x000500000001904d-37.dat	upx
behavioral1/memory/2676-39-0x000007FEF5870000-0x000007FEF5F35000-memory.dmp	upx

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 3 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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	3b91d7f0be55606bcdf71b37a18f34c298156b12181ff7c944fb7a1818916736N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Client-built.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
2344	schtasks.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2868	Client-built.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 792 wrote to memory of 2868	792	3b91d7f0be55606bcdf71b37a18f34c298156b12181ff7c944fb7a1818916736N.exe	30
PID 792 wrote to memory of 2868	792	3b91d7f0be55606bcdf71b37a18f34c298156b12181ff7c944fb7a1818916736N.exe	30
PID 792 wrote to memory of 2868	792	3b91d7f0be55606bcdf71b37a18f34c298156b12181ff7c944fb7a1818916736N.exe	30
PID 792 wrote to memory of 2868	792	3b91d7f0be55606bcdf71b37a18f34c298156b12181ff7c944fb7a1818916736N.exe	30
PID 792 wrote to memory of 2420	792	3b91d7f0be55606bcdf71b37a18f34c298156b12181ff7c944fb7a1818916736N.exe	31
PID 792 wrote to memory of 2420	792	3b91d7f0be55606bcdf71b37a18f34c298156b12181ff7c944fb7a1818916736N.exe	31
PID 792 wrote to memory of 2420	792	3b91d7f0be55606bcdf71b37a18f34c298156b12181ff7c944fb7a1818916736N.exe	31
PID 792 wrote to memory of 2420	792	3b91d7f0be55606bcdf71b37a18f34c298156b12181ff7c944fb7a1818916736N.exe	31
PID 2420 wrote to memory of 2676	2420	Built.exe	32
PID 2420 wrote to memory of 2676	2420	Built.exe	32
PID 2420 wrote to memory of 2676	2420	Built.exe	32
PID 2868 wrote to memory of 2344	2868	Client-built.exe	34
PID 2868 wrote to memory of 2344	2868	Client-built.exe	34
PID 2868 wrote to memory of 2344	2868	Client-built.exe	34
PID 2868 wrote to memory of 2344	2868	Client-built.exe	34

C:\Users\Admin\AppData\Local\Temp\3b91d7f0be55606bcdf71b37a18f34c298156b12181ff7c944fb7a1818916736N.exe
"C:\Users\Admin\AppData\Local\Temp\3b91d7f0be55606bcdf71b37a18f34c298156b12181ff7c944fb7a1818916736N.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:792
- C:\Users\Admin\AppData\Local\Temp\FolderName\Client-built.exe
  "C:\Users\Admin\AppData\Local\Temp\FolderName\Client-built.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2868
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "System" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\FolderName\Client-built.exe" /rl HIGHEST /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2344
- C:\Users\Admin\AppData\Local\Temp\FolderName\Built.exe
  "C:\Users\Admin\AppData\Local\Temp\FolderName\Built.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:2420
- - C:\Users\Admin\AppData\Local\Temp\FolderName\Built.exe
    "C:\Users\Admin\AppData\Local\Temp\FolderName\Built.exe"
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    PID:2676

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

Credential Access

Discovery

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:\Users\Admin\AppData\Local\Temp\_MEI24202\python312.dll

Filesize
1.7MB

MD5
6f7c42579f6c2b45fe866747127aef09

SHA1
b9487372fe3ed61022e52cc8dbd37e6640e87723

SHA256
07642b6a3d99ce88cff790087ac4e2ba0b2da1100cf1897f36e096427b580ee5

SHA512
aadf06fd6b4e14f600b0a614001b8c31e42d71801adec7c9c177dcbb4956e27617fa45ba477260a7e06d2ca4979ed5acc60311258427ee085e8025b61452acec

Download Submit
\Users\Admin\AppData\Local\Temp\FolderName\Built.exe

Filesize
7.5MB

MD5
f6c1ca73d58bee19392afdf533bac4b3

SHA1
35e4a258a6f3834e7a3164d929b6333ba91ab9d9

SHA256
ea7ff4296f265854109ce36e1cd4e1d4b9afd94fe5d22392421da5b07c9f5e32

SHA512
714fdc94576245696b9c7948cc997a536380e54b5a2b2342321e3ef50ae8d413ab91c71774510defe28245b7e7d6d410905a76922cc3da4305c772a3043a8435

Download Submit
\Users\Admin\AppData\Local\Temp\FolderName\Client-built.exe

Filesize
348KB

MD5
fa9b24d2daf3f8cf5e8fb84a4b0cd197

SHA1
03cfb24c35b7f79fd1ce716dd2402ca56d09a349

SHA256
f429a38b014770d38d3c95aca9e5169c6d2aee6731ae6dacf2b8d2911bdb0827

SHA512
987beefe76c56a58ff279ca08b5f702cdf5bfed3d64c47ef8c041b4a10f5dd9b475f1cbc856b3a0ae55c310bde67b672a70a11d5b961608910d7b22d2d5bc5b6

Download Submit
memory/2676-39-0x000007FEF5870000-0x000007FEF5F35000-memory.dmp

Filesize
6.8MB

Download
memory/2868-36-0x0000000073ACE000-0x0000000073ACF000-memory.dmp

Filesize
4KB

Download
memory/2868-40-0x0000000000E40000-0x0000000000E9E000-memory.dmp

Filesize
376KB

Download
memory/2868-41-0x0000000073AC0000-0x00000000741AE000-memory.dmp

Filesize
6.9MB

Download
memory/2868-44-0x0000000073ACE000-0x0000000073ACF000-memory.dmp

Filesize
4KB

Download
memory/2868-45-0x0000000073AC0000-0x00000000741AE000-memory.dmp

Filesize
6.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads