quasar | 4a412162a0b00623211b7303bc18b00b76d196ea8343a2c35abc262e9e97c9b2

Analysis

max time kernel
150s
max time network
155s
platform
windows10-2004_x64
resource
win10v2004-20230703-en
resource tags

arch:x64arch:x86image:win10v2004-20230703-enlocale:en-usos:windows10-2004-x64system
submitted
24-08-2023 15:56

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General

Target

AOU2.exe
Size

1.3MB
MD5

6ef27bb17948bf2cd5f17d32506ab25f
SHA1

1cace02f54cb1696be68e2ee291e26c051293a51
SHA256

4a412162a0b00623211b7303bc18b00b76d196ea8343a2c35abc262e9e97c9b2
SHA512

38d33e4f1d445ddbb5a45be34f369e60b22f5c29733e3acec9b156851e8494cd5845d22b2c71794b51c2ae73a890685f35dc1738c0e706f8b93c2272545885de
SSDEEP

24576:0KWHORcD/gtB49yDx553XTWcdjrFY5des+Lpq1qe9UdaRkss0:MHMRBO4TxXTLtLpqjOd+kss

Score

10^/10

quasar office04 persistence spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office04

173.225.115.99:7702

Mutex

ecce8627-6b34-425d-8f0e-3a8923c66220

Attributes

encryption_key
F04A75E6507173FAEEC2BB82C564030A5E8413FF
install_name
ser.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
quar

Signatures

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

Quasar payload 6 IoCs

resource	yara_rule
behavioral2/files/0x00080000000231f6-50.dat	family_quasar
behavioral2/files/0x00080000000231f6-49.dat	family_quasar
behavioral2/files/0x00080000000231f6-39.dat	family_quasar
behavioral2/memory/1840-52-0x0000000000690000-0x0000000000714000-memory.dmp	family_quasar
behavioral2/files/0x0006000000023220-62.dat	family_quasar
behavioral2/files/0x0006000000023220-61.dat	family_quasar

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\856S4e89hA9ANBPMkRMWYwByaI1dh.exe	b52gate.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\856S4e89hA9ANBPMkRMWYwByaI1dh.exe	b52gate.exe

Executes dropped EXE 6 IoCs

pid	Process
2212	fend.exe
2440	gate.exe
2060	VB64.exe
1840	qua.exe
3896	ser.exe
1832	b52gate.exe

Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1722984668-1829624581-3022101259-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\b52gate = "C:\\Users\\Admin\\AppData\\Roaming\\b52gate\\b52gate.exe"	b52gate.exe

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

System Information Discovery
T1082

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1840	qua.exe
Token: SeDebugPrivilege	3896	ser.exe
Token: SeDebugPrivilege	2440	gate.exe

Suspicious use of FindShellTrayWindow 3 IoCs

pid	Process
2440	gate.exe
1832	b52gate.exe
3896	ser.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3896	ser.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4828 wrote to memory of 2212	4828	AOU2.exe	82
PID 4828 wrote to memory of 2212	4828	AOU2.exe	82
PID 4828 wrote to memory of 2440	4828	AOU2.exe	83
PID 4828 wrote to memory of 2440	4828	AOU2.exe	83
PID 4828 wrote to memory of 2440	4828	AOU2.exe	83
PID 4828 wrote to memory of 2060	4828	AOU2.exe	84
PID 4828 wrote to memory of 2060	4828	AOU2.exe	84
PID 4828 wrote to memory of 1840	4828	AOU2.exe	85
PID 4828 wrote to memory of 1840	4828	AOU2.exe	85
PID 1840 wrote to memory of 3896	1840	qua.exe	86
PID 1840 wrote to memory of 3896	1840	qua.exe	86
PID 2440 wrote to memory of 1832	2440	gate.exe	87
PID 2440 wrote to memory of 1832	2440	gate.exe	87
PID 2440 wrote to memory of 1832	2440	gate.exe	87

C:\Users\Admin\AppData\Local\Temp\AOU2.exe
"C:\Users\Admin\AppData\Local\Temp\AOU2.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4828
- C:\Users\Admin\AppData\Local\Temp\fend.exe
  "C:\Users\Admin\AppData\Local\Temp\fend.exe"
  2⤵
  - Executes dropped EXE
  PID:2212
- C:\Users\Admin\AppData\Local\Temp\gate.exe
  "C:\Users\Admin\AppData\Local\Temp\gate.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of WriteProcessMemory
  PID:2440
- - C:\Users\Admin\AppData\Roaming\b52gate\b52gate.exe
    "C:\Users\Admin\AppData\Roaming\b52gate\b52gate.exe"
    3⤵
    - Drops startup file
    - Executes dropped EXE
    - Adds Run key to start application
    - Suspicious use of FindShellTrayWindow
    PID:1832
- C:\Users\Admin\AppData\Local\Temp\VB64.exe
  "C:\Users\Admin\AppData\Local\Temp\VB64.exe"
  2⤵
  - Executes dropped EXE
  PID:2060
- C:\Users\Admin\AppData\Local\Temp\qua.exe
  "C:\Users\Admin\AppData\Local\Temp\qua.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1840
- - C:\Users\Admin\AppData\Roaming\quar\ser.exe
    "C:\Users\Admin\AppData\Roaming\quar\ser.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of FindShellTrayWindow
    - Suspicious use of SendNotifyMessage
    PID:3896

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\VB64.exe

Filesize
55KB

MD5
0dbad8bd336bf6e2bec7a323a1162c7b

SHA1
adb907702c963f8aa7e2580a93a89f62139cc013

SHA256
09faa0f38dbbb5dfb4a821fb88589727f4410ede321a5e2858c1edaee538a047

SHA512
b1524f3d41e4237bf454d0da437fef4945e1484d884f06dd251c9725fc48469c96e1f620889b6e3b38b361b6c25d84a05ad5e362a86274acd39d044f9183c91b

Download Submit
C:\Users\Admin\AppData\Local\Temp\VB64.exe

Filesize
55KB

MD5
0dbad8bd336bf6e2bec7a323a1162c7b

SHA1
adb907702c963f8aa7e2580a93a89f62139cc013

SHA256
09faa0f38dbbb5dfb4a821fb88589727f4410ede321a5e2858c1edaee538a047

SHA512
b1524f3d41e4237bf454d0da437fef4945e1484d884f06dd251c9725fc48469c96e1f620889b6e3b38b361b6c25d84a05ad5e362a86274acd39d044f9183c91b

Download Submit
C:\Users\Admin\AppData\Local\Temp\VB64.exe

Filesize
55KB

MD5
0dbad8bd336bf6e2bec7a323a1162c7b

SHA1
adb907702c963f8aa7e2580a93a89f62139cc013

SHA256
09faa0f38dbbb5dfb4a821fb88589727f4410ede321a5e2858c1edaee538a047

SHA512
b1524f3d41e4237bf454d0da437fef4945e1484d884f06dd251c9725fc48469c96e1f620889b6e3b38b361b6c25d84a05ad5e362a86274acd39d044f9183c91b

Download Submit
C:\Users\Admin\AppData\Local\Temp\fend.exe

Filesize
14KB

MD5
db7180315606402c98b528205c4f5168

SHA1
7b7c070eb123622d56d43b0ffff6547bc0d5d09a

SHA256
824d880eb5ecfe7e0d74b59957748af9603e293f32f2b2466d1c76347dfcaa78

SHA512
e4edae6b0d5dfedf9ac0c8cb65155267a6bfaa108a23be61d372cc968f50f595f577ef6fd862165989939215001bb73e5057bfd39f72a328ff8d34b98bbf76ab

Download Submit
C:\Users\Admin\AppData\Local\Temp\fend.exe

Filesize
14KB

MD5
db7180315606402c98b528205c4f5168

SHA1
7b7c070eb123622d56d43b0ffff6547bc0d5d09a

SHA256
824d880eb5ecfe7e0d74b59957748af9603e293f32f2b2466d1c76347dfcaa78

SHA512
e4edae6b0d5dfedf9ac0c8cb65155267a6bfaa108a23be61d372cc968f50f595f577ef6fd862165989939215001bb73e5057bfd39f72a328ff8d34b98bbf76ab

Download Submit
C:\Users\Admin\AppData\Local\Temp\fend.exe

Filesize
14KB

MD5
db7180315606402c98b528205c4f5168

SHA1
7b7c070eb123622d56d43b0ffff6547bc0d5d09a

SHA256
824d880eb5ecfe7e0d74b59957748af9603e293f32f2b2466d1c76347dfcaa78

SHA512
e4edae6b0d5dfedf9ac0c8cb65155267a6bfaa108a23be61d372cc968f50f595f577ef6fd862165989939215001bb73e5057bfd39f72a328ff8d34b98bbf76ab

Download Submit
C:\Users\Admin\AppData\Local\Temp\gate.exe

Filesize
95KB

MD5
f2c20580687d5e95b9c7226390115e76

SHA1
7e61b259c635fdc4b4c3fb42a72b9182f556743b

SHA256
5d91b008b2dbb987d22919f46a42811fd0a0d9c44e3e89f2cd771937daf147dd

SHA512
a7bb282d5b8036ffa34aae9cd6f9d50e04879307966e5fde3831b334f436423777bf7ab9cd7c25dd88ede8be36cce10f3dd128e107ed3217ccd954ea1b3f7129

Download Submit
C:\Users\Admin\AppData\Local\Temp\gate.exe

Filesize
95KB

MD5
f2c20580687d5e95b9c7226390115e76

SHA1
7e61b259c635fdc4b4c3fb42a72b9182f556743b

SHA256
5d91b008b2dbb987d22919f46a42811fd0a0d9c44e3e89f2cd771937daf147dd

SHA512
a7bb282d5b8036ffa34aae9cd6f9d50e04879307966e5fde3831b334f436423777bf7ab9cd7c25dd88ede8be36cce10f3dd128e107ed3217ccd954ea1b3f7129

Download Submit
C:\Users\Admin\AppData\Local\Temp\gate.exe

Filesize
95KB

MD5
f2c20580687d5e95b9c7226390115e76

SHA1
7e61b259c635fdc4b4c3fb42a72b9182f556743b

SHA256
5d91b008b2dbb987d22919f46a42811fd0a0d9c44e3e89f2cd771937daf147dd

SHA512
a7bb282d5b8036ffa34aae9cd6f9d50e04879307966e5fde3831b334f436423777bf7ab9cd7c25dd88ede8be36cce10f3dd128e107ed3217ccd954ea1b3f7129

Download Submit
C:\Users\Admin\AppData\Local\Temp\qua.exe

Filesize
502KB

MD5
94735a9ba9ccfd4df241558b39a1c897

SHA1
e35aee5b3bf2762fb28f30867dc7ef6c0c7abcc6

SHA256
f55f318a58f3229681697e3405142697fa925455222a5a1f272fd34e9c84e314

SHA512
0cb13d79a6946e3224d98157e3d4cd1f6eacd6a55e2b47e7a9db88ff11a54559ddf1f0ffefd78ab497bc08038a96afed47da418563c3de77921e49207a88d16a

Download Submit
C:\Users\Admin\AppData\Local\Temp\qua.exe

Filesize
502KB

MD5
94735a9ba9ccfd4df241558b39a1c897

SHA1
e35aee5b3bf2762fb28f30867dc7ef6c0c7abcc6

SHA256
f55f318a58f3229681697e3405142697fa925455222a5a1f272fd34e9c84e314

SHA512
0cb13d79a6946e3224d98157e3d4cd1f6eacd6a55e2b47e7a9db88ff11a54559ddf1f0ffefd78ab497bc08038a96afed47da418563c3de77921e49207a88d16a

Download Submit
C:\Users\Admin\AppData\Local\Temp\qua.exe

Filesize
502KB

MD5
94735a9ba9ccfd4df241558b39a1c897

SHA1
e35aee5b3bf2762fb28f30867dc7ef6c0c7abcc6

SHA256
f55f318a58f3229681697e3405142697fa925455222a5a1f272fd34e9c84e314

SHA512
0cb13d79a6946e3224d98157e3d4cd1f6eacd6a55e2b47e7a9db88ff11a54559ddf1f0ffefd78ab497bc08038a96afed47da418563c3de77921e49207a88d16a

Download Submit
C:\Users\Admin\AppData\Roaming\b52gate\b52gate.exe

Filesize
95KB

MD5
f2c20580687d5e95b9c7226390115e76

SHA1
7e61b259c635fdc4b4c3fb42a72b9182f556743b

SHA256
5d91b008b2dbb987d22919f46a42811fd0a0d9c44e3e89f2cd771937daf147dd

SHA512
a7bb282d5b8036ffa34aae9cd6f9d50e04879307966e5fde3831b334f436423777bf7ab9cd7c25dd88ede8be36cce10f3dd128e107ed3217ccd954ea1b3f7129

Download Submit
C:\Users\Admin\AppData\Roaming\b52gate\b52gate.exe

Filesize
95KB

MD5
f2c20580687d5e95b9c7226390115e76

SHA1
7e61b259c635fdc4b4c3fb42a72b9182f556743b

SHA256
5d91b008b2dbb987d22919f46a42811fd0a0d9c44e3e89f2cd771937daf147dd

SHA512
a7bb282d5b8036ffa34aae9cd6f9d50e04879307966e5fde3831b334f436423777bf7ab9cd7c25dd88ede8be36cce10f3dd128e107ed3217ccd954ea1b3f7129

Download Submit
C:\Users\Admin\AppData\Roaming\quar\ser.exe

Filesize
502KB

MD5
94735a9ba9ccfd4df241558b39a1c897

SHA1
e35aee5b3bf2762fb28f30867dc7ef6c0c7abcc6

SHA256
f55f318a58f3229681697e3405142697fa925455222a5a1f272fd34e9c84e314

SHA512
0cb13d79a6946e3224d98157e3d4cd1f6eacd6a55e2b47e7a9db88ff11a54559ddf1f0ffefd78ab497bc08038a96afed47da418563c3de77921e49207a88d16a

Download Submit
C:\Users\Admin\AppData\Roaming\quar\ser.exe

Filesize
502KB

MD5
94735a9ba9ccfd4df241558b39a1c897

SHA1
e35aee5b3bf2762fb28f30867dc7ef6c0c7abcc6

SHA256
f55f318a58f3229681697e3405142697fa925455222a5a1f272fd34e9c84e314

SHA512
0cb13d79a6946e3224d98157e3d4cd1f6eacd6a55e2b47e7a9db88ff11a54559ddf1f0ffefd78ab497bc08038a96afed47da418563c3de77921e49207a88d16a

Download Submit
memory/1832-91-0x0000000074D50000-0x0000000075301000-memory.dmp

Filesize
5.7MB

Download
memory/1832-82-0x0000000001190000-0x00000000011A0000-memory.dmp

Filesize
64KB

Download
memory/1832-81-0x0000000074D50000-0x0000000075301000-memory.dmp

Filesize
5.7MB

Download
memory/1832-83-0x0000000074D50000-0x0000000075301000-memory.dmp

Filesize
5.7MB

Download
memory/1840-66-0x00007FF92CBA0000-0x00007FF92D661000-memory.dmp

Filesize
10.8MB

Download
memory/1840-52-0x0000000000690000-0x0000000000714000-memory.dmp

Filesize
528KB

Download
memory/1840-55-0x000000001B340000-0x000000001B350000-memory.dmp

Filesize
64KB

Download
memory/1840-57-0x00007FF92CBA0000-0x00007FF92D661000-memory.dmp

Filesize
10.8MB

Download
memory/2060-87-0x00007FF92CBA0000-0x00007FF92D661000-memory.dmp

Filesize
10.8MB

Download
memory/2060-58-0x000001EBF3B40000-0x000001EBF3B50000-memory.dmp

Filesize
64KB

Download
memory/2060-46-0x000001EBF3760000-0x000001EBF3772000-memory.dmp

Filesize
72KB

Download
memory/2060-53-0x00007FF92CBA0000-0x00007FF92D661000-memory.dmp

Filesize
10.8MB

Download
memory/2060-89-0x000001EBF3B40000-0x000001EBF3B50000-memory.dmp

Filesize
64KB

Download
memory/2212-84-0x00007FF92CBA0000-0x00007FF92D661000-memory.dmp

Filesize
10.8MB

Download
memory/2212-16-0x0000016D82340000-0x0000016D8234A000-memory.dmp

Filesize
40KB

Download
memory/2212-44-0x00007FF92CBA0000-0x00007FF92D661000-memory.dmp

Filesize
10.8MB

Download
memory/2440-80-0x0000000074D50000-0x0000000075301000-memory.dmp

Filesize
5.7MB

Download
memory/2440-56-0x0000000074D50000-0x0000000075301000-memory.dmp

Filesize
5.7MB

Download
memory/3896-65-0x000000001B660000-0x000000001B670000-memory.dmp

Filesize
64KB

Download
memory/3896-64-0x00007FF92CBA0000-0x00007FF92D661000-memory.dmp

Filesize
10.8MB

Download
memory/3896-85-0x000000001C140000-0x000000001C190000-memory.dmp

Filesize
320KB

Download
memory/3896-86-0x000000001C250000-0x000000001C302000-memory.dmp

Filesize
712KB

Download
memory/3896-90-0x00007FF92CBA0000-0x00007FF92D661000-memory.dmp

Filesize
10.8MB

Download
memory/4828-0-0x00000000001B0000-0x00000000002FA000-memory.dmp

Filesize
1.3MB

Download
memory/4828-1-0x00007FF92CBA0000-0x00007FF92D661000-memory.dmp

Filesize
10.8MB

Download
memory/4828-54-0x00007FF92CBA0000-0x00007FF92D661000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads