quasar | 4b4fb5711222878e343088374f7437bce99a5916d7e5c410b2763fde8d91ec63

General

Target

Client-built.exe
Size

3.1MB
MD5

b29c8e703911c242f88f9f2d1be23121
SHA1

8adc17f1e94eeb0d95d35825c91b788d70d28de1
SHA256

4b4fb5711222878e343088374f7437bce99a5916d7e5c410b2763fde8d91ec63
SHA512

4c37427e88f6f17344be909ebfbb33e053a0b999f28230a548f343dbf1081ec511701cf61101eef3c9e99400ab73759050b34a9e973eb8fabf892bb2a886a74f
SSDEEP

49152:DvTlL26AaNeWgPhlmVqvMQ7XSKo9UksoG6STHHB72eh2NT:DvJL26AaNeWgPhlmVqkQ7XSKo9UL

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

127.0.0.7:5053

127.0.0.7:5054

Mutex

6f01cc79-8527-4436-a34a-473fcf92b46f

Attributes

encryption_key
D52EA8296126E8DD7D221BC02E2826F1CAA96C78
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 payload 4 IoCs

resource	yara_rule
behavioral1/memory/2952-0-0x0000000000390000-0x00000000006B4000-memory.dmp	family_quasar
behavioral1/files/0x0009000000012266-6.dat	family_quasar
behavioral1/files/0x0009000000012266-7.dat	family_quasar
behavioral1/memory/2976-9-0x00000000001D0000-0x00000000004F4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2976	Client.exe

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

System Information Discovery
T1082

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
2532	schtasks.exe
2676	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2952	Client-built.exe
Token: SeDebugPrivilege	2976	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2976	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2976	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2952 wrote to memory of 2676	2952	Client-built.exe	28
PID 2952 wrote to memory of 2676	2952	Client-built.exe	28
PID 2952 wrote to memory of 2676	2952	Client-built.exe	28
PID 2952 wrote to memory of 2976	2952	Client-built.exe	30
PID 2952 wrote to memory of 2976	2952	Client-built.exe	30
PID 2952 wrote to memory of 2976	2952	Client-built.exe	30
PID 2976 wrote to memory of 2532	2976	Client.exe	32
PID 2976 wrote to memory of 2532	2976	Client.exe	32
PID 2976 wrote to memory of 2532	2976	Client.exe	32

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⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2952
- 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⤵
  - Creates scheduled task(s)
  PID:2676
- 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 FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:2976
- - 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⤵
    - Creates scheduled task(s)
    PID:2532

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

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
b29c8e703911c242f88f9f2d1be23121

SHA1
8adc17f1e94eeb0d95d35825c91b788d70d28de1

SHA256
4b4fb5711222878e343088374f7437bce99a5916d7e5c410b2763fde8d91ec63

SHA512
4c37427e88f6f17344be909ebfbb33e053a0b999f28230a548f343dbf1081ec511701cf61101eef3c9e99400ab73759050b34a9e973eb8fabf892bb2a886a74f

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

Filesize
3.1MB

MD5
b29c8e703911c242f88f9f2d1be23121

SHA1
8adc17f1e94eeb0d95d35825c91b788d70d28de1

SHA256
4b4fb5711222878e343088374f7437bce99a5916d7e5c410b2763fde8d91ec63

SHA512
4c37427e88f6f17344be909ebfbb33e053a0b999f28230a548f343dbf1081ec511701cf61101eef3c9e99400ab73759050b34a9e973eb8fabf892bb2a886a74f

Download Submit
memory/2952-0-0x0000000000390000-0x00000000006B4000-memory.dmp

Filesize
3.1MB

Download
memory/2952-1-0x000007FEF5BD0000-0x000007FEF65BC000-memory.dmp

Filesize
9.9MB

Download
memory/2952-2-0x000000001B1E0000-0x000000001B260000-memory.dmp

Filesize
512KB

Download
memory/2952-8-0x000007FEF5BD0000-0x000007FEF65BC000-memory.dmp

Filesize
9.9MB

Download
memory/2976-9-0x00000000001D0000-0x00000000004F4000-memory.dmp

Filesize
3.1MB

Download
memory/2976-10-0x000007FEF5BD0000-0x000007FEF65BC000-memory.dmp

Filesize
9.9MB

Download
memory/2976-11-0x000000001B290000-0x000000001B310000-memory.dmp

Filesize
512KB

Download
memory/2976-12-0x000007FEF5BD0000-0x000007FEF65BC000-memory.dmp

Filesize
9.9MB

Download
memory/2976-13-0x000000001B290000-0x000000001B310000-memory.dmp

Filesize
512KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads