quasar | 4b4fb5711222878e343088374f7437bce99a5916d7e5c410b2763fde8d91ec63

Analysis

max time kernel
1799s
max time network
1138s
platform
windows10-2004_x64
resource
win10v2004-20231023-en
resource tags

arch:x64arch:x86image:win10v2004-20231023-enlocale:en-usos:windows10-2004-x64system
submitted
27/11/2023, 09:27

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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

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 3 IoCs

resource	yara_rule
behavioral2/memory/416-0-0x0000000000F60000-0x0000000001284000-memory.dmp	family_quasar
behavioral2/files/0x0006000000022cd9-6.dat	family_quasar
behavioral2/files/0x0006000000022cd9-7.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2944	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
3248	schtasks.exe
2284	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	416	Client-built.exe
Token: SeDebugPrivilege	2944	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2944	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2944	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 416 wrote to memory of 3248	416	Client-built.exe	86
PID 416 wrote to memory of 3248	416	Client-built.exe	86
PID 416 wrote to memory of 2944	416	Client-built.exe	88
PID 416 wrote to memory of 2944	416	Client-built.exe	88
PID 2944 wrote to memory of 2284	2944	Client.exe	90
PID 2944 wrote to memory of 2284	2944	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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:416
- 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:3248
- 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:2944
- - 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:2284

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

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/416-0-0x0000000000F60000-0x0000000001284000-memory.dmp

Filesize
3.1MB

Download
memory/416-1-0x00007FFFAAC80000-0x00007FFFAB741000-memory.dmp

Filesize
10.8MB

Download
memory/416-2-0x000000001BED0000-0x000000001BEE0000-memory.dmp

Filesize
64KB

Download
memory/416-10-0x00007FFFAAC80000-0x00007FFFAB741000-memory.dmp

Filesize
10.8MB

Download
memory/2944-9-0x00007FFFAAC80000-0x00007FFFAB741000-memory.dmp

Filesize
10.8MB

Download
memory/2944-11-0x000000001B570000-0x000000001B580000-memory.dmp

Filesize
64KB

Download
memory/2944-12-0x000000001C480000-0x000000001C4D0000-memory.dmp

Filesize
320KB

Download
memory/2944-13-0x000000001C590000-0x000000001C642000-memory.dmp

Filesize
712KB

Download
memory/2944-14-0x00007FFFAAC80000-0x00007FFFAB741000-memory.dmp

Filesize
10.8MB

Download
memory/2944-15-0x000000001B570000-0x000000001B580000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads