quasar | 8814843156c38bc50027a0c9b7f3fa849f80c0c8fd9f737cba1ccafcda22ad7b

General

Target
8814843156c38bc50027a0c9b7f3fa849f80c0c8fd9f737cba1ccafcda22ad7b.exe
Size 459KB
Sample260826-nrd7fsyamd
SHA256 8814843156c38bc50027a0c9b7f3fa849f80c0c8fd9f737cba1ccafcda22ad7b
MD5 8662a057ff38172a3210f4d14d5025e2
SHA1 5bd613e0889bede14ecfc3c0a057022bb06046eb
SHA512 83f0277a50896f94859642fef9e73493719405ea6359118556c49ac3c8d83db6ffe59a7082d7a37b924e65fd2c481120a326a9dbcf26e2dffa6f997346056a28
SSDEEP 6144:AE/UNb8eITqGQpKtH+mnGzaaScDxqPRxgRfFP/gMpX/LfDcXbLPFNxTbdy+5://UNxITqGQJ5GaScPFQMF/L7cnHH55
TLSH
T136A4391827F88726E0FF6B74F575445887F9F40EA26EFF4F0A04A4AA2C667519C503A3
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

office04 execution quasar persistence spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.7.1

Botnet

Office04

C2

127.0.0.1:8443

Mutex

5f296532-b857-4cc3-b032-3d06f79cb2bb

Attributes

encryption_key
5EE9240E1DB06E47E58F3C5EDE5123870EE33E1D
install_name
Client.exe
key_salt
bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941
log_directory
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
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral1/memory/1668-0-0x0000000000010000-0x0000000000088000-memory.dmp	family_quasar
behavioral1/files/0x000c00000002446c-5.dat	family_quasar

Executes dropped EXE 2 IoCs

pid	Process
4976	Client.exe
3264	Client.exe

ConfuserEx .NET packer 1 IoCs

Detects ConfuserEx .NET packer.

resource	yara_rule
behavioral1/files/0x000c00000002446c-5.dat	ConfuserEx

Drops file in System32 directory 6 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\Client.exe	8814843156c38bc50027a0c9b7f3fa849f80c0c8fd9f737cba1ccafcda22ad7b.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	8814843156c38bc50027a0c9b7f3fa849f80c0c8fd9f737cba1ccafcda22ad7b.exe
File opened for modification	C:\Windows\system32\SubDir	8814843156c38bc50027a0c9b7f3fa849f80c0c8fd9f737cba1ccafcda22ad7b.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client.exe
File opened for modification	C:\Windows\system32\SubDir	Client.exe
File opened for modification	C:\Windows\system32\SubDir\connection.log	Client.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
3788	schtasks.exe
4824	schtasks.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1668	8814843156c38bc50027a0c9b7f3fa849f80c0c8fd9f737cba1ccafcda22ad7b.exe
Token: SeDebugPrivilege	4976	Client.exe
Token: SeDebugPrivilege	3264	Client.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1668 wrote to memory of 3788	1668	8814843156c38bc50027a0c9b7f3fa849f80c0c8fd9f737cba1ccafcda22ad7b.exe	85
PID 1668 wrote to memory of 4976	1668	8814843156c38bc50027a0c9b7f3fa849f80c0c8fd9f737cba1ccafcda22ad7b.exe	88
PID 4976 wrote to memory of 4824	4976	Client.exe	90

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\8814843156c38bc50027a0c9b7f3fa849f80c0c8fd9f737cba1ccafcda22ad7b.exe
"C:\Users\Admin\AppData\Local\Temp\8814843156c38bc50027a0c9b7f3fa849f80c0c8fd9f737cba1ccafcda22ad7b.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1668
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3788
- 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 WriteProcessMemory
  PID:4976
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4824

C:\Windows\system32\SubDir\Client.exe
C:\Windows\system32\SubDir\Client.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3264

Network

MITRE ATT&CK Enterprise v16

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

Client.exe

Path C:\Windows\System32\SubDir\Client.exe
Size 459KB
SHA256 8814843156c38bc50027a0c9b7f3fa849f80c0c8fd9f737cba1ccafcda22ad7b
MD5 8662a057ff38172a3210f4d14d5025e2
SHA1 5bd613e0889bede14ecfc3c0a057022bb06046eb
SHA512 83f0277a50896f94859642fef9e73493719405ea6359118556c49ac3c8d83db6ffe59a7082d7a37b924e65fd2c481120a326a9dbcf26e2dffa6f997346056a28
SSDEEP 6144:AE/UNb8eITqGQpKtH+mnGzaaScDxqPRxgRfFP/gMpX/LfDcXbLPFNxTbdy+5://UNxITqGQJ5GaScPFQMF/L7cnHH55
TLSH
T136A4391827F88726E0FF6B74F575445887F9F40EA26EFF4F0A04A4AA2C667519C503A3
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

connection.log

Path C:\Windows\System32\SubDir\connection.log
Size 6KB
SHA256 54c69754cd60a09fc0a92de249e6a14b3d77bd499836152a4a6464d5beff5f02
MD5 624c6d6ef7ba597f4cfd915a4c29ad6d
SHA1 99bdddb0e35c8ba911d3ff43b0f56a33ebbda731
SHA512 ec46a270cb584fd3d14820694c40b152704769e3b4d5023226bd0897cc8e18d9d3e1aa67b67d4fe884eb7f12e5ceda17d1028661cc280d3809aa611e436f467d
SSDEEP 96:KJqM4qMOqM3qMQqMWqMZqMmqMgqMlqMuqM4qa:VMzM5M6MrMBMsMRM7M4MZMza
TLSH
T1A1D14AB2EB35B474767609A160E4F605A171A4B04398F80739BC0A55F7FB3A08BB47ED
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1668-0-0x0000000000010000-0x0000000000088000-memory.dmp

Download

memory/1668-1-0x000000001ADC0000-0x000000001ADD0000-memory.dmp

Download

memory/4976-8-0x000000001AF30000-0x000000001AF40000-memory.dmp

Download

memory/4976-14-0x000000001AF30000-0x000000001AF40000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads