quasar | 7c7d0a81bb0037aa2d509217e0464572444cb79154470e72f364755fab99b7d4

Resubmissions

20-05-2024 19:57

240520-ypg6faeg63 10

20-05-2024 19:53

240520-yl85raef59 10

Analysis

max time kernel
1798s
max time network
1802s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
20-05-2024 19:53

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General

Target

LastExternal.exe
Size

3.1MB
MD5

d89bcb84ff94321d131f8f826a7177f5
SHA1

3612cb183adeb6225f7ae0ac4425e8072baebb9c
SHA256

7c7d0a81bb0037aa2d509217e0464572444cb79154470e72f364755fab99b7d4
SHA512

2830d50245e266338a90163e9945a91623bc839d0d4657cdd6d6d8b8970c981e0eeaa1778f2ed5ecf61bcd870c03aa0a9d2e6dce0be461d13e6dfad17db7cf0d
SSDEEP

49152:yv6Y52fyaSZOrPWluWBuGG5g5h0kxG1v1LoGKd+THHB72eh2NT:yvP52fyaSZOrPWluWBDG5g5h0kxK

Score

10^/10

quasar cw2 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Cw2

127.0.0.1:8080

Mutex

eeb96fcd-c654-4ba2-9a84-d3d5cfa5eee3

Attributes

encryption_key
7A857EF3A3EB39AF399F1F3800FB9F842DC83C9E
install_name
Client.exe
log_directory
Logs
reconnect_delay
1
startup_key
W
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/4620-1-0x0000000000DE0000-0x0000000001104000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

5548 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

Processes:

schtasks.exeschtasks.exe

pid process

4596 schtasks.exe
1936 schtasks.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

LastExternal.exeClient.exesvchost.exe

description pid process

Token: SeDebugPrivilege 4620 LastExternal.exe
Token: SeDebugPrivilege 5548 Client.exe
Token: SeManageVolumePrivilege 4392 svchost.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid process

5548 Client.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid process

5548 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

5548 Client.exe

pid	process
5548	Client.exe

pid	process
4596	schtasks.exe
1936	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	4620	LastExternal.exe
Token: SeDebugPrivilege	5548	Client.exe
Token: SeManageVolumePrivilege	4392	svchost.exe

pid	process
5548	Client.exe

pid	process
5548	Client.exe

pid	process
5548	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

LastExternal.exeClient.exe

description	pid	process	target process
PID 4620 wrote to memory of 4596	4620	LastExternal.exe	schtasks.exe
PID 4620 wrote to memory of 4596	4620	LastExternal.exe	schtasks.exe
PID 4620 wrote to memory of 5548	4620	LastExternal.exe	Client.exe
PID 4620 wrote to memory of 5548	4620	LastExternal.exe	Client.exe
PID 5548 wrote to memory of 1936	5548	Client.exe	schtasks.exe
PID 5548 wrote to memory of 1936	5548	Client.exe	schtasks.exe

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\LastExternal.exe
"C:\Users\Admin\AppData\Local\Temp\LastExternal.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4620

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "W" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:4596

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 SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:5548

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "W" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:1936

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1324 --field-trial-handle=2280,i,1836084024518340990,18250262151825427757,262144 --variations-seed-version /prefetch:8
1⤵
PID:4680

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3908 --field-trial-handle=2280,i,1836084024518340990,18250262151825427757,262144 --variations-seed-version /prefetch:8
1⤵
PID:4256

C:\Windows\system32\rundll32.exe
"C:\Windows\system32\rundll32.exe" "C:\Windows\SYSTEM32\EDGEHTML.dll",#141 Microsoft.VCLibs.140.00_8wekyb3d8bbwe
1⤵
PID:5540

C:\Windows\System32\svchost.exe
C:\Windows\System32\svchost.exe -k UnistackSvcGroup
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4392

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
d89bcb84ff94321d131f8f826a7177f5

SHA1
3612cb183adeb6225f7ae0ac4425e8072baebb9c

SHA256
7c7d0a81bb0037aa2d509217e0464572444cb79154470e72f364755fab99b7d4

SHA512
2830d50245e266338a90163e9945a91623bc839d0d4657cdd6d6d8b8970c981e0eeaa1778f2ed5ecf61bcd870c03aa0a9d2e6dce0be461d13e6dfad17db7cf0d

Download Submit
memory/4392-16-0x00000215BC640000-0x00000215BC650000-memory.dmp

Filesize
64KB

Download
memory/4392-51-0x00000215C4AA0000-0x00000215C4AA1000-memory.dmp

Filesize
4KB

Download
memory/4392-52-0x00000215C4BB0000-0x00000215C4BB1000-memory.dmp

Filesize
4KB

Download
memory/4392-50-0x00000215C4AA0000-0x00000215C4AA1000-memory.dmp

Filesize
4KB

Download
memory/4392-48-0x00000215C4A70000-0x00000215C4A71000-memory.dmp

Filesize
4KB

Download
memory/4392-33-0x00000215BC750000-0x00000215BC760000-memory.dmp

Filesize
64KB

Download
memory/4620-1-0x0000000000DE0000-0x0000000001104000-memory.dmp

Filesize
3.1MB

Download
memory/4620-2-0x00007FFD84570000-0x00007FFD85031000-memory.dmp

Filesize
10.8MB

Download
memory/4620-0-0x00007FFD84573000-0x00007FFD84575000-memory.dmp

Filesize
8KB

Download
memory/4620-11-0x00007FFD84570000-0x00007FFD85031000-memory.dmp

Filesize
10.8MB

Download
memory/5548-9-0x00007FFD84570000-0x00007FFD85031000-memory.dmp

Filesize
10.8MB

Download
memory/5548-15-0x00007FFD84570000-0x00007FFD85031000-memory.dmp

Filesize
10.8MB

Download
memory/5548-14-0x00007FFD84570000-0x00007FFD85031000-memory.dmp

Filesize
10.8MB

Download
memory/5548-13-0x000000001CA30000-0x000000001CAE2000-memory.dmp

Filesize
712KB

Download
memory/5548-12-0x000000001C920000-0x000000001C970000-memory.dmp

Filesize
320KB

Download
memory/5548-10-0x00007FFD84570000-0x00007FFD85031000-memory.dmp

Filesize
10.8MB

Download