quasar | b9e40ddacf304c8bca72e85f6874c5c0a6faf805546fddbf715be13d83075b05

General

Target

Client-built.exe
Size

3.1MB
MD5

7a02a595b7bd1078ffc896e35cb32a01
SHA1

4196a3ad1b599fba5fe93283dae0de4fe04cb5b7
SHA256

b9e40ddacf304c8bca72e85f6874c5c0a6faf805546fddbf715be13d83075b05
SHA512

05155aab2585b35793d5fc1fd2beda2457ed70f7fc37551ff6dddb222005ca08c4008a3f352cf6cb85658eca8e510d50af07e3eaee1b8da37ccd15eb45c42eb1
SSDEEP

49152:uv8hBYjCO4Dt2d5aKCuVPzlEmVQL0wvwkas+YNjhtooGdoTHHB72eh2NT:uv2t2d5aKCuVPzlEmVQ0wvwfs+Yy

Score

10^/10

quasar microsoft support discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Microsoft Support

C2

147.185.221.25:57276

172.20.10.2:57276

Mutex

a4de83b9-ee43-4481-a07e-43005040ecb1

Attributes

encryption_key
208881ED62CAC7B5AB660B49C4B307B67863D844
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Microsoft Support
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/4644-1-0x0000000000970000-0x0000000000C94000-memory.dmp	family_quasar
behavioral2/files/0x000b000000023ccf-6.dat	family_quasar

Downloads MZ/PE file 1 IoCs

flow	pid	Process
37	3580	Process not Found

Executes dropped EXE 1 IoCs

pid	Process
4820	Client.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client.exe
File opened for modification	C:\Windows\system32\SubDir	Client.exe
File created	C:\Windows\system32\SubDir\Client.exe	Client-built.exe

System Location Discovery: System Language Discovery 1 TTPs 1 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	MicrosoftEdgeUpdate.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
1148	MicrosoftEdgeUpdate.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
2728	schtasks.exe
1056	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4644	Client-built.exe
Token: SeDebugPrivilege	4820	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4820	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4644 wrote to memory of 1056	4644	Client-built.exe	89
PID 4644 wrote to memory of 1056	4644	Client-built.exe	89
PID 4644 wrote to memory of 4820	4644	Client-built.exe	91
PID 4644 wrote to memory of 4820	4644	Client-built.exe	91
PID 4820 wrote to memory of 2728	4820	Client.exe	92
PID 4820 wrote to memory of 2728	4820	Client.exe	92

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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4644
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Microsoft Support" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1056
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4820
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Microsoft Support" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2728

C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz48cmVxdWVzdCBwcm90b2NvbD0iMy4wIiB1cGRhdGVyPSJPbWFoYSIgdXBkYXRlcnZlcnNpb249IjEuMy4xOTUuNDMiIHNoZWxsX3ZlcnNpb249IjEuMy4xOTUuNDMiIGlzbWFjaGluZT0iMSIgc2Vzc2lvbmlkPSJ7N0YzRDhDMjktNTU2Ri00RURDLUJFMDctMjY2RTQ3NTI1ODZFfSIgdXNlcmlkPSJ7NTc0OEUxREItODA2Qy00RjgyLTg0NEEtNjVCRkZBODU2ODhDfSIgaW5zdGFsbHNvdXJjZT0ibGltaXRlZCIgcmVxdWVzdGlkPSJ7NEUxNjA1QTUtMjgwQy00NTEzLThCRUQtRjcwNDExMzZBNEI3fSIgZGVkdXA9ImNyIiBkb21haW5qb2luZWQ9IjAiPjxodyBsb2dpY2FsX2NwdXM9IjIiIHBoeXNtZW1vcnk9IjQiIGRpc2tfdHlwZT0iMiIgc3NlPSIxIiBzc2UyPSIxIiBzc2UzPSIxIiBzc3NlMz0iMSIgc3NlNDE9IjEiIHNzZTQyPSIxIiBhdng9IjEiLz48b3MgcGxhdGZvcm09IndpbiIgdmVyc2lvbj0iMTAuMC4xOTA0MS4xMjg4IiBzcD0iIiBhcmNoPSJ4NjQiIHByb2R1Y3RfdHlwZT0iNDgiIGlzX3dpcD0iMCIgaXNfaW5fbG9ja2Rvd25fbW9kZT0iMCIvPjxvZW0gcHJvZHVjdF9tYW51ZmFjdHVyZXI9IiIgcHJvZHVjdF9uYW1lPSIiLz48ZXhwIGV0YWc9IiZxdW90O0UreGJBejZZNnNVMTI4OWJTNnFsNFZSTGJramZCVUdUTUpzanJIcjQ0aUk9JnF1b3Q7Ii8-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSIyIiBpbnN0YWxsZGF0ZXRpbWU9IjE3Mzg5NDcxNzgiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4MzQxOTY4MDM3MTAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI1MjQ3NTgxMTc0Ii8-PC9hcHA-PC9yZXF1ZXN0Pg
1⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
PID:1148

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

Query Registry

1

T1012

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\System32\SubDir\Client.exe

Filesize
3.1MB

MD5
7a02a595b7bd1078ffc896e35cb32a01

SHA1
4196a3ad1b599fba5fe93283dae0de4fe04cb5b7

SHA256
b9e40ddacf304c8bca72e85f6874c5c0a6faf805546fddbf715be13d83075b05

SHA512
05155aab2585b35793d5fc1fd2beda2457ed70f7fc37551ff6dddb222005ca08c4008a3f352cf6cb85658eca8e510d50af07e3eaee1b8da37ccd15eb45c42eb1

Download Submit
memory/4644-0-0x00007FFC21693000-0x00007FFC21695000-memory.dmp

Filesize
8KB

Download
memory/4644-1-0x0000000000970000-0x0000000000C94000-memory.dmp

Filesize
3.1MB

Download
memory/4644-2-0x00007FFC21690000-0x00007FFC22151000-memory.dmp

Filesize
10.8MB

Download
memory/4644-9-0x00007FFC21690000-0x00007FFC22151000-memory.dmp

Filesize
10.8MB

Download
memory/4820-10-0x00007FFC21690000-0x00007FFC22151000-memory.dmp

Filesize
10.8MB

Download
memory/4820-11-0x00007FFC21690000-0x00007FFC22151000-memory.dmp

Filesize
10.8MB

Download
memory/4820-12-0x000000001B950000-0x000000001B9A0000-memory.dmp

Filesize
320KB

Download
memory/4820-13-0x000000001C090000-0x000000001C142000-memory.dmp

Filesize
712KB

Download
memory/4820-14-0x00007FFC21690000-0x00007FFC22151000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads