quasar | 282d6f5ddc83351dab51e6decc1293b078638f0cfd0baca4673afc8246fd32bd

General

Target

kreo q zi.7z
Size

922KB
MD5

ec516db688f94e98d5141f4bade557e9
SHA1

198ffbae5eed415ac673f5e371774759f1a53de1
SHA256

282d6f5ddc83351dab51e6decc1293b078638f0cfd0baca4673afc8246fd32bd
SHA512

ecc34ad7d15fbedbbc4e62b469f5e6e5e71099e19831574da61dc9f751ed5b2faad1676b8b3dbf0911c4dac628c7a15e9d07d953692c5ab1b700ea07f6396985
SSDEEP

24576:yScP7qLl4iGQATiKL0aywxTodSrUF+nVZLLymvgDoSAWcNtMXqWOU:07qLl4KATiJUo0UEnLmmvqiWcNtMXDOU

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

hola435-24858.portmap.host:24858

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

resource	yara_rule
behavioral1/files/0x00280000000450da-2.dat	family_quasar
behavioral1/memory/4388-5-0x0000000000BA0000-0x0000000000EC4000-memory.dmp	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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-641261377-2215826147-608237349-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 2 IoCs

pid	Process
4388	kreo q zi.exe
2384	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

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-641261377-2215826147-608237349-1000_Classes\Local Settings	Client.exe
Key created	\REGISTRY\USER\S-1-5-21-641261377-2215826147-608237349-1000_Classes\Local Settings	OpenWith.exe
Key created	\REGISTRY\USER\S-1-5-21-641261377-2215826147-608237349-1000_Classes\Local Settings	OpenWith.exe
Key created	\REGISTRY\USER\S-1-5-21-641261377-2215826147-608237349-1000_Classes\Local Settings	OpenWith.exe
Key created	\REGISTRY\USER\S-1-5-21-641261377-2215826147-608237349-1000_Classes\Local Settings	OpenWith.exe
Key created	\REGISTRY\USER\S-1-5-21-641261377-2215826147-608237349-1000_Classes\Local Settings	OpenWith.exe
Key created	\REGISTRY\USER\S-1-5-21-641261377-2215826147-608237349-1000_Classes\Local Settings	OpenWith.exe

Opens file in notepad (likely ransom note) 1 IoCs

ransomware

pid	Process
4984	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

pid	Process
4148	schtasks.exe
3168	schtasks.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3740	7zFM.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeRestorePrivilege	3740	7zFM.exe
Token: 35	3740	7zFM.exe
Token: SeSecurityPrivilege	3740	7zFM.exe
Token: SeDebugPrivilege	4388	kreo q zi.exe
Token: SeDebugPrivilege	2384	Client.exe

Suspicious use of FindShellTrayWindow 3 IoCs

pid	Process
3740	7zFM.exe
3740	7zFM.exe
3740	7zFM.exe

Suspicious use of SetWindowsHookEx 7 IoCs

pid	Process
2384	Client.exe
3196	OpenWith.exe
4896	OpenWith.exe
1060	OpenWith.exe
1564	OpenWith.exe
4368	OpenWith.exe
4932	OpenWith.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4388 wrote to memory of 4148	4388	kreo q zi.exe	93
PID 4388 wrote to memory of 4148	4388	kreo q zi.exe	93
PID 4388 wrote to memory of 2384	4388	kreo q zi.exe	95
PID 4388 wrote to memory of 2384	4388	kreo q zi.exe	95
PID 2384 wrote to memory of 3168	2384	Client.exe	96
PID 2384 wrote to memory of 3168	2384	Client.exe	96
PID 2384 wrote to memory of 4984	2384	Client.exe	105
PID 2384 wrote to memory of 4984	2384	Client.exe	105

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:\Program Files\7-Zip\7zFM.exe
"C:\Program Files\7-Zip\7zFM.exe" "C:\Users\Admin\AppData\Local\Temp\kreo q zi.7z"
1⤵
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
PID:3740

C:\Users\Admin\Desktop\kreo q zi.exe
"C:\Users\Admin\Desktop\kreo q zi.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4388
- 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:4148
- 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:2384
- - 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:3168
- - C:\Windows\system32\NOTEPAD.EXE
    "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\ntuser.ini
    3⤵
    - Opens file in notepad (likely ransom note)
    PID:4984

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:3196

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:4896

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:1060

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:1564

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:4368

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:4932

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\Desktop\kreo q zi.exe

Filesize
3.1MB

MD5
28ac02fc40c8f1c2a8989ee3c09a1372

SHA1
b182758b62a1482142c0fce4be78c786e08b7025

SHA256
0fe81f9a51cf0068408de3c3605ce2033a00bd7ec90cc9516c38f6069e06433b

SHA512
2cbf2f6af46e5fae8e67144e1ac70bc748036c7adb7f7810d7d7d9f255ccf5d163cce07f11fb6526f9ab61c39f28bdf2356cc315b19a61cd2115612882eab767

Download Submit
memory/2384-10-0x00000000032B0000-0x0000000003300000-memory.dmp

Filesize
320KB

Download
memory/2384-11-0x000000001D2D0000-0x000000001D382000-memory.dmp

Filesize
712KB

Download
memory/2384-14-0x000000001BE50000-0x000000001BE62000-memory.dmp

Filesize
72KB

Download
memory/2384-15-0x000000001D9D0000-0x000000001DA0C000-memory.dmp

Filesize
240KB

Download
memory/4388-4-0x00007FFA7AA83000-0x00007FFA7AA85000-memory.dmp

Filesize
8KB

Download
memory/4388-5-0x0000000000BA0000-0x0000000000EC4000-memory.dmp

Filesize
3.1MB

Download
memory/4388-6-0x00007FFA7AA80000-0x00007FFA7B542000-memory.dmp

Filesize
10.8MB

Download
memory/4388-9-0x00007FFA7AA80000-0x00007FFA7B542000-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