quasar | 440271ab4c5959d7679fe00e6b223bcb8401a869e72d464cde8f880ff62f58da

General

Target

thesigma.exe
Size

1.6MB
MD5

7689437063c4eb4aab919fd25de6702d
SHA1

36252a4df082fef51b2a1ab07f771e17860986d1
SHA256

440271ab4c5959d7679fe00e6b223bcb8401a869e72d464cde8f880ff62f58da
SHA512

13b874366ae7c25ba70f79cc3bd36af8668f3a0c750696c149a8cc15ee6cb850b002612ee519188910884b391b41667f1b072dac2d7a3a44a265f25201c22145
SSDEEP

24576:0IjFRSPYlrMKgc6bN5WV63pDWWb6ohTLzeUtfjldLNvyvI:1jDaYlrM/NhLfdLNMI

Score

10^/10

quasar slave spyware trojan

Malware Config

Extracted

Family

quasar

Version

3.1.5

Botnet

Slave

C2

nugget1234-38628.portmap.host:38628

Mutex

$Sxr-AYc4tpo0KefMRW4CpM

Attributes

encryption_key
O77hjXYiXiE656Wt67Lm
install_name
System.exe
log_directory
Logs
reconnect_delay
1000
startup_key
WindowsAudioHelper
subdirectory
Windows

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
C:\Users\Admin\kysss.exe	family_quasar
behavioral1/memory/4628-43-0x0000000000D40000-0x0000000000DAC000-memory.dmp	family_quasar

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

thesigma.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2288054676-1871194608-3559553667-1000\Control Panel\International\Geo\Nation	thesigma.exe

Executes dropped EXE 2 IoCs

Processes:

SeroR0X1.exekysss.exe

pid process

3196 SeroR0X1.exe
4628 kysss.exe
Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

18 ip-api.com
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
3196	SeroR0X1.exe
4628	kysss.exe

flow	ioc
18	ip-api.com

Checks SCSI registry key(s) 3 TTPs 3 IoCs

SCSI information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Processes:

taskmgr.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000	taskmgr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\Properties\{b725f130-47ef-101a-a5f1-02608c9eebac}\000A	taskmgr.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\FriendlyName	taskmgr.exe

Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exe

pid process

4564 schtasks.exe

pid	process
4564	schtasks.exe

Suspicious behavior: EnumeratesProcesses 24 IoCs

Processes:

taskmgr.exe

pid	process
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

kysss.exetaskmgr.exe

description	pid	process
Token: SeDebugPrivilege	4628	kysss.exe
Token: SeDebugPrivilege	3152	taskmgr.exe
Token: SeSystemProfilePrivilege	3152	taskmgr.exe
Token: SeCreateGlobalPrivilege	3152	taskmgr.exe

Suspicious use of FindShellTrayWindow 36 IoCs

Processes:

taskmgr.exe

pid	process
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe

Suspicious use of SendNotifyMessage 36 IoCs

Processes:

taskmgr.exe

pid	process
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe
3152	taskmgr.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

thesigma.exekysss.exe

description	pid	process	target process
PID 3352 wrote to memory of 3196	3352	thesigma.exe	SeroR0X1.exe
PID 3352 wrote to memory of 3196	3352	thesigma.exe	SeroR0X1.exe
PID 3352 wrote to memory of 4628	3352	thesigma.exe	kysss.exe
PID 3352 wrote to memory of 4628	3352	thesigma.exe	kysss.exe
PID 3352 wrote to memory of 4628	3352	thesigma.exe	kysss.exe
PID 4628 wrote to memory of 4564	4628	kysss.exe	schtasks.exe
PID 4628 wrote to memory of 4564	4628	kysss.exe	schtasks.exe
PID 4628 wrote to memory of 4564	4628	kysss.exe	schtasks.exe

C:\Users\Admin\AppData\Local\Temp\thesigma.exe
"C:\Users\Admin\AppData\Local\Temp\thesigma.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3352

C:\Users\Admin\AppData\Local\SeroR0X1.exe
"C:\Users\Admin\AppData\Local\SeroR0X1.exe"
2⤵
- Executes dropped EXE
PID:3196

C:\Users\Admin\kysss.exe
"C:\Users\Admin\kysss.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4628

C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "WindowsAudioHelper" /sc ONLOGON /tr "C:\Users\Admin\kysss.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:4564

C:\Windows\system32\taskmgr.exe
"C:\Windows\system32\taskmgr.exe" /4
1⤵
- Checks SCSI registry key(s)
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
PID:3152

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

3

T1082

Peripheral Device Discovery

1

T1120

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

C:\Users\Admin\AppData\Local\SeroR0X1.exe
Filesize
1.2MB

MD5
344e503504ab85f745091fc9b84e6da4

SHA1
1fdcb8c74f8b4cb9d2783446681e64b8dd0dd14a

SHA256
c5ded6fd8541173abf2aee16808c2444249d92ad0cb2ed832087dc5fa57e7885

SHA512
c20c7df32aff991a5da0b8446dc7c91f833747be147deb2f1c6e991cac9519e5f0933996c420b3402123021fdf58cf0bcfaf8f0fc4a5b6205bd63d08548aa667

Download Submit
C:\Users\Admin\kysss.exe
Filesize
410KB

MD5
67bb0deed2d9593f08f90381b84d2b57

SHA1
452c8d9c37d77552636e643087d282dd05764fce

SHA256
c88480ebfa75fa6e61f2bfd801ead4d30f6e6c462d2a7331010b2fc0c935ed8a

SHA512
aca90ddfad451c31bb38aec9b7eefdd0d1460fc69b2dbe865d29d75eb7c7f59850634b37074bd7701e5c951f079ed72273bfb21879d3dea2e8dfa42481e1e51e

Download Submit
memory/3152-67-0x00000260D2DD0000-0x00000260D2DD1000-memory.dmp

Filesize
4KB

Download
memory/3152-66-0x00000260D2DD0000-0x00000260D2DD1000-memory.dmp

Filesize
4KB

Download
memory/3152-64-0x00000260D2DD0000-0x00000260D2DD1000-memory.dmp

Filesize
4KB

Download
memory/3152-65-0x00000260D2DD0000-0x00000260D2DD1000-memory.dmp

Filesize
4KB

Download
memory/3152-63-0x00000260D2DD0000-0x00000260D2DD1000-memory.dmp

Filesize
4KB

Download
memory/3152-62-0x00000260D2DD0000-0x00000260D2DD1000-memory.dmp

Filesize
4KB

Download
memory/3152-61-0x00000260D2DD0000-0x00000260D2DD1000-memory.dmp

Filesize
4KB

Download
memory/3152-55-0x00000260D2DD0000-0x00000260D2DD1000-memory.dmp

Filesize
4KB

Download
memory/3152-56-0x00000260D2DD0000-0x00000260D2DD1000-memory.dmp

Filesize
4KB

Download
memory/3152-57-0x00000260D2DD0000-0x00000260D2DD1000-memory.dmp

Filesize
4KB

Download
memory/3196-53-0x0000020C9A480000-0x0000020C9A629000-memory.dmp

Filesize
1.7MB

Download
memory/3196-42-0x0000020C9A160000-0x0000020C9A170000-memory.dmp

Filesize
64KB

Download
memory/3196-40-0x0000020CFFA20000-0x0000020CFFB5E000-memory.dmp

Filesize
1.2MB

Download
memory/3196-54-0x00007FFB61930000-0x00007FFB623F1000-memory.dmp

Filesize
10.8MB

Download
memory/3196-41-0x00007FFB61930000-0x00007FFB623F1000-memory.dmp

Filesize
10.8MB

Download
memory/4628-48-0x00000000056D0000-0x0000000005736000-memory.dmp

Filesize
408KB

Download
memory/4628-47-0x0000000005640000-0x0000000005650000-memory.dmp

Filesize
64KB

Download
memory/4628-46-0x0000000005770000-0x0000000005802000-memory.dmp

Filesize
584KB

Download
memory/4628-45-0x0000000073EC0000-0x0000000074670000-memory.dmp

Filesize
7.7MB

Download
memory/4628-44-0x0000000005C80000-0x0000000006224000-memory.dmp

Filesize
5.6MB

Download
memory/4628-51-0x0000000006BC0000-0x0000000006BCA000-memory.dmp

Filesize
40KB

Download
memory/4628-43-0x0000000000D40000-0x0000000000DAC000-memory.dmp

Filesize
432KB

Download
memory/4628-49-0x0000000005C10000-0x0000000005C22000-memory.dmp

Filesize
72KB

Download
memory/4628-50-0x0000000006A10000-0x0000000006A4C000-memory.dmp

Filesize
240KB

Download
memory/4628-70-0x0000000073EC0000-0x0000000074670000-memory.dmp

Filesize
7.7MB

Download
memory/4628-71-0x0000000005640000-0x0000000005650000-memory.dmp

Filesize
64KB

Download
memory/4628-72-0x0000000073EC0000-0x0000000074670000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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