quasar | 4cdeb2eae1cec1ab07077142313c524e9cf360cdec63497538c4405c2d8ded62

Analysis

max time kernel
50s
max time network
461s
platform
windows11-21h2_x64
resource
win11-20240508-en
resource tags

arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
submitted
30-06-2024 14:19

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General

Target

Quasar v1.4.1/Quasar.exe
Size

1.2MB
MD5

12ebf922aa80d13f8887e4c8c5e7be83
SHA1

7f87a80513e13efd45175e8f2511c2cd17ff51e8
SHA256

43315abb9c8be9a39782bd8694a7ea9f16a867500dc804454d04b8bf2c15c51e
SHA512

fda5071e15cf077d202b08db741bbfb3dbd815acc41deec7b7d44e055cac408e2f2de7233f8f9c5c618afd00ffc2fc4c6e8352cbdf18f9aab55d980dcb58a275
SSDEEP

12288:IwPs012cBBBYiL9l/bFfpBBBBBBBBBBBBcA:jBBBYiLvzFfpBBBBBBBBBBBBcA

Score

10^/10

quasar spyware trojan

Malware Config

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar payload 2 IoCs

Processes:

resource yara_rule

behavioral10/memory/1624-1-0x000001AAA2800000-0x000001AAA2938000-memory.dmp family_quasar
behavioral10/memory/1624-2-0x000001AAA2DC0000-0x000001AAA2DD6000-memory.dmp family_quasar
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

resource	yara_rule
behavioral10/memory/1624-1-0x000001AAA2800000-0x000001AAA2938000-memory.dmp	family_quasar
behavioral10/memory/1624-2-0x000001AAA2DC0000-0x000001AAA2DD6000-memory.dmp	family_quasar

Modifies Internet Explorer settings 1 TTPs 2 IoCs

adware spyware

Modify Registry

T1112

Processes:

explorer.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-3433428765-2473475212-4279855560-1000\Software\Microsoft\Internet Explorer\Toolbar	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-3433428765-2473475212-4279855560-1000\Software\Microsoft\Internet Explorer\Toolbar\Locked = "1"	explorer.exe

Modifies registry class 5 IoCs

Processes:

explorer.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-3433428765-2473475212-4279855560-1000_Classes\Local Settings	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-3433428765-2473475212-4279855560-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-3433428765-2473475212-4279855560-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3433428765-2473475212-4279855560-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3433428765-2473475212-4279855560-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = ffffffff	explorer.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

Quasar.exe

description pid process

Token: SeDebugPrivilege 1624 Quasar.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Quasar.exe

pid process

1624 Quasar.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Quasar.exe

pid process

1624 Quasar.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

explorer.exe

pid process

876 explorer.exe
Suspicious use of WriteProcessMemory 2 IoCs

Processes:

Quasar.exe

description pid process target process

PID 1624 wrote to memory of 632 1624 Quasar.exe explorer.exe
PID 1624 wrote to memory of 632 1624 Quasar.exe explorer.exe

description	pid	process
Token: SeDebugPrivilege	1624	Quasar.exe

pid	process
1624	Quasar.exe

pid	process
1624	Quasar.exe

pid	process
876	explorer.exe

description	pid	process	target process
PID 1624 wrote to memory of 632	1624	Quasar.exe	explorer.exe
PID 1624 wrote to memory of 632	1624	Quasar.exe	explorer.exe

C:\Users\Admin\AppData\Local\Temp\Quasar v1.4.1\Quasar.exe
"C:\Users\Admin\AppData\Local\Temp\Quasar v1.4.1\Quasar.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1624

C:\Windows\explorer.exe
"C:\Windows\explorer.exe" /select, "C:\Users\Admin\AppData\Local\Temp\Quasar v1.4.1\quasar.p12"
2⤵
PID:632

C:\Windows\explorer.exe
C:\Windows\explorer.exe /factory,{75dff2b7-6936-4c06-a8bb-676a7b00b24b} -Embedding
1⤵
- Modifies Internet Explorer settings
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:876

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:4212

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\Windows\Explorer\iconcache_idx.db
Filesize
14KB

MD5
8b0db1922b300badec414af13c231630

SHA1
5a175ad6744083ae427c66f3ff238c8a23b52a7c

SHA256
844ae96b032247958fe7a28d39d5553ef6cee1342a6bee56f3f9291eb2be22aa

SHA512
e1055ce1d1881ef9a7dc2a4ae4835510fa8c3ec3822f8151041f894726a2d6afdc79a91bfed05382a5628537502a08d433ad17918e277703f13247231e923952

Download Submit
C:\Users\Admin\AppData\Local\Temp\Quasar v1.4.1\quasar.p12
Filesize
4KB

MD5
7b557a796c20348d91dd5ea246b77054

SHA1
6474adc1bf55cbd17daf12c7a04c785682268cbf

SHA256
c3d7a215a488aad143e8b275ab914a2a7ac1f9a1f4480b2e26411daf2fdb049c

SHA512
4ae3dc132a9c6222da0f831b3246cc98501288ca60df75bd8e645d7b9118c945f242ecdd8af17a30fdc4c2a53ed9765a8487b180fc667397627d1ea515fc7a8f

Download Submit
memory/1624-8-0x00007FFB728F0000-0x00007FFB733B2000-memory.dmp

Filesize
10.8MB

Download
memory/1624-9-0x00007FFB728F0000-0x00007FFB733B2000-memory.dmp

Filesize
10.8MB

Download
memory/1624-4-0x00007FFB728F0000-0x00007FFB733B2000-memory.dmp

Filesize
10.8MB

Download
memory/1624-5-0x00007FFB728F0000-0x00007FFB733B2000-memory.dmp

Filesize
10.8MB

Download
memory/1624-6-0x00007FFB728F0000-0x00007FFB733B2000-memory.dmp

Filesize
10.8MB

Download
memory/1624-7-0x000001AABF840000-0x000001AABFB6E000-memory.dmp

Filesize
3.2MB

Download
memory/1624-1-0x000001AAA2800000-0x000001AAA2938000-memory.dmp

Filesize
1.2MB

Download
memory/1624-3-0x00007FFB728F0000-0x00007FFB733B2000-memory.dmp

Filesize
10.8MB

Download
memory/1624-10-0x00007FFB728F0000-0x00007FFB733B2000-memory.dmp

Filesize
10.8MB

Download
memory/1624-2-0x000001AAA2DC0000-0x000001AAA2DD6000-memory.dmp

Filesize
88KB

Download
memory/1624-31-0x000001AABF4A0000-0x000001AABF4F0000-memory.dmp

Filesize
320KB

Download
memory/1624-33-0x000001AAC10A0000-0x000001AAC10EC000-memory.dmp

Filesize
304KB

Download
memory/1624-32-0x000001AAC1160000-0x000001AAC1212000-memory.dmp

Filesize
712KB

Download
memory/1624-30-0x000001AABF430000-0x000001AABF448000-memory.dmp

Filesize
96KB

Download
memory/1624-0-0x00007FFB728F3000-0x00007FFB728F5000-memory.dmp

Filesize
8KB

Download