quasar | b1b8ad9032b829e2ac3956ce8f302745802cd2d5ae686c700796e2f2ee81b0f7

General

Target

mielda loco 12.exe
Size

3.1MB
MD5

4ae7ab9b981922837aae1c86c7f726a3
SHA1

1783e0788fb2a103d71bc9a05ae2fb85c0d70ee9
SHA256

b1b8ad9032b829e2ac3956ce8f302745802cd2d5ae686c700796e2f2ee81b0f7
SHA512

79c4bf39ae1761414b5f37186c2483a4b8755168824d6e783ea9cab26e7c0118f391b6417c622b65ea3ac3924ae745a6abe4838ca1d87671898ad90ae9a18e58
SSDEEP

49152:Cv+lL26AaNeWgPhlmVqvMQ7XSK6v9y/ZBxOPoGdexMTHHB72eh2NT:CvuL26AaNeWgPhlmVqkQ7XSK64/M2

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

Cristopher11sa-62565.portmap.host:62565

Mutex

e51e2b65-e963-4051-9736-67d57ed46798

Attributes

encryption_key
AEA258EF65BF1786F0F767C0BE2497ECC304C46F
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/3980-1-0x0000000000150000-0x0000000000474000-memory.dmp	family_quasar
behavioral1/files/0x0028000000045031-3.dat	family_quasar

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

Processes:

Client.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4152190078-1497776152-96910572-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid	Process
4052	Client.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Modifies registry class 7 IoCs

Processes:

OpenWith.exeOpenWith.exeOpenWith.exeClient.exeOpenWith.exeOpenWith.exeOpenWith.exe

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-4152190078-1497776152-96910572-1000_Classes\Local Settings	OpenWith.exe
Key created	\REGISTRY\USER\S-1-5-21-4152190078-1497776152-96910572-1000_Classes\Local Settings	OpenWith.exe
Key created	\REGISTRY\USER\S-1-5-21-4152190078-1497776152-96910572-1000_Classes\Local Settings	OpenWith.exe
Key created	\REGISTRY\USER\S-1-5-21-4152190078-1497776152-96910572-1000_Classes\Local Settings	Client.exe
Key created	\REGISTRY\USER\S-1-5-21-4152190078-1497776152-96910572-1000_Classes\Local Settings	OpenWith.exe
Key created	\REGISTRY\USER\S-1-5-21-4152190078-1497776152-96910572-1000_Classes\Local Settings	OpenWith.exe
Key created	\REGISTRY\USER\S-1-5-21-4152190078-1497776152-96910572-1000_Classes\Local Settings	OpenWith.exe

Opens file in notepad (likely ransom note) 1 IoCs

ransomware

Processes:

NOTEPAD.EXE

pid	Process
3256	NOTEPAD.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

Processes:

schtasks.exeschtasks.exe

pid	Process
476	schtasks.exe
2416	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

mielda loco 12.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	3980	mielda loco 12.exe
Token: SeDebugPrivilege	4052	Client.exe

Suspicious use of SetWindowsHookEx 7 IoCs

Processes:

Client.exeOpenWith.exeOpenWith.exeOpenWith.exeOpenWith.exeOpenWith.exeOpenWith.exe

pid	Process
4052	Client.exe
1280	OpenWith.exe
3300	OpenWith.exe
2248	OpenWith.exe
2396	OpenWith.exe
4796	OpenWith.exe
2368	OpenWith.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

mielda loco 12.exeClient.exe

description	pid	Process	procid_target
PID 3980 wrote to memory of 476	3980	mielda loco 12.exe	82
PID 3980 wrote to memory of 476	3980	mielda loco 12.exe	82
PID 3980 wrote to memory of 4052	3980	mielda loco 12.exe	84
PID 3980 wrote to memory of 4052	3980	mielda loco 12.exe	84
PID 4052 wrote to memory of 2416	4052	Client.exe	85
PID 4052 wrote to memory of 2416	4052	Client.exe	85
PID 4052 wrote to memory of 3256	4052	Client.exe	101
PID 4052 wrote to memory of 3256	4052	Client.exe	101

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\mielda loco 12.exe
"C:\Users\Admin\AppData\Local\Temp\mielda loco 12.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3980
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:476
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Modifies registry class
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4052
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2416
- - C:\Windows\system32\NOTEPAD.EXE
    "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\ntuser.ini
    3⤵
    - Opens file in notepad (likely ransom note)
    PID:3256

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:1280

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:3300

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:2248

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:2396

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:4796

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:2368

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

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
3.1MB

MD5
4ae7ab9b981922837aae1c86c7f726a3

SHA1
1783e0788fb2a103d71bc9a05ae2fb85c0d70ee9

SHA256
b1b8ad9032b829e2ac3956ce8f302745802cd2d5ae686c700796e2f2ee81b0f7

SHA512
79c4bf39ae1761414b5f37186c2483a4b8755168824d6e783ea9cab26e7c0118f391b6417c622b65ea3ac3924ae745a6abe4838ca1d87671898ad90ae9a18e58

Download Submit
memory/3980-6-0x00007FFC25E40000-0x00007FFC26902000-memory.dmp

Filesize
10.8MB

Download
memory/3980-1-0x0000000000150000-0x0000000000474000-memory.dmp

Filesize
3.1MB

Download
memory/3980-2-0x00007FFC25E40000-0x00007FFC26902000-memory.dmp

Filesize
10.8MB

Download
memory/3980-0-0x00007FFC25E43000-0x00007FFC25E45000-memory.dmp

Filesize
8KB

Download
memory/4052-7-0x00007FFC25E40000-0x00007FFC26902000-memory.dmp

Filesize
10.8MB

Download
memory/4052-5-0x00007FFC25E40000-0x00007FFC26902000-memory.dmp

Filesize
10.8MB

Download
memory/4052-8-0x000000001C9B0000-0x000000001CA00000-memory.dmp

Filesize
320KB

Download
memory/4052-9-0x000000001CAC0000-0x000000001CB72000-memory.dmp

Filesize
712KB

Download
memory/4052-12-0x000000001CA60000-0x000000001CA72000-memory.dmp

Filesize
72KB

Download
memory/4052-13-0x000000001D5C0000-0x000000001D5FC000-memory.dmp

Filesize
240KB

Download
memory/4052-14-0x00007FFC25E40000-0x00007FFC26902000-memory.dmp

Filesize
10.8MB

Download
memory/4052-15-0x00007FFC25E40000-0x00007FFC26902000-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