quasar | fbbb647aeb0707b5897f74bc3616b275406c6fce1ac0409a6f582fdfcc2de147

General

Target

taskhosts-cleaned.exe
Size

385KB
MD5

6e5babe25aad66144dd2e15ab97bd38b
SHA1

61d589a0814a1ef9a0b1a06454f9761fe81ddbff
SHA256

fbbb647aeb0707b5897f74bc3616b275406c6fce1ac0409a6f582fdfcc2de147
SHA512

6547309b05f1ffec63c5ea9c92bb536d37ca1b7104df936324ba19dfb53dff0aa9135f3a9bd4aa0ae46a210048db9b5694424e00bd47e2cb2ab63df5a4f52896
SSDEEP

6144:F8jlR5z3XxhxrL8rK/A0j1/zTzTLNozbLRpw34urkR10efUK0:FMlHzHxhV/Aqipw3XQztfK

Score

10^/10

quasar down persistence spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0.0

Botnet

Down

C2

simplmizer.duckdns.org:1337

Mutex

rhoc35VS3mkrMtkPb1

Attributes

encryption_key
AN1JmoUwwzfA1Metx4Ze
install_name
taskhost.exe
log_directory
Logs
reconnect_delay
3000
startup_key
EdgeBrowser
subdirectory
SubDir

Signatures

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

Quasar payload 4 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3572-133-0x0000000000050000-0x00000000000B6000-memory.dmp	family_quasar
C:\Windows\SysWOW64\SubDir\taskhost.exe	family_quasar
C:\Windows\SysWOW64\SubDir\taskhost.exe	family_quasar
C:\Windows\SysWOW64\SubDir\taskhost.exe	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:

taskhost.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3259792829-1422303781-2047321929-1000\Control Panel\International\Geo\Nation	taskhost.exe

Executes dropped EXE 2 IoCs

Processes:

taskhost.exetaskhost.exe

pid process

4664 taskhost.exe
1596 taskhost.exe

pid	process
4664	taskhost.exe
1596	taskhost.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

taskhost.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3259792829-1422303781-2047321929-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\EdgeBrowser = "\"C:\\Windows\\SysWOW64\\SubDir\\taskhost.exe\""	taskhost.exe

Looks up external IP address via web service 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

10 ip-api.com
14 api.ipify.org
Drops autorun.inf file 1 TTPs 2 IoCs
Malware can abuse Windows Autorun to spread further via attached volumes.

Replication Through Removable Media
T1091

Processes:

taskhost.exe

description ioc process

File created C:\autorun.inf taskhost.exe
File created F:\autorun.inf taskhost.exe

flow	ioc
10	ip-api.com
14	api.ipify.org

description	ioc	process
File created	C:\autorun.inf	taskhost.exe
File created	F:\autorun.inf	taskhost.exe

Drops file in System32 directory 4 IoCs

Processes:

taskhosts-cleaned.exetaskhost.exe

description	ioc	process
File created	C:\Windows\SysWOW64\SubDir\taskhost.exe	taskhosts-cleaned.exe
File opened for modification	C:\Windows\SysWOW64\SubDir\taskhost.exe	taskhosts-cleaned.exe
File opened for modification	C:\Windows\SysWOW64\SubDir\taskhost.exe	taskhost.exe
File opened for modification	C:\Windows\SysWOW64\SubDir	taskhost.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 3 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exeschtasks.exeschtasks.exe

pid process

2528 schtasks.exe
212 schtasks.exe
3928 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

taskhosts-cleaned.exetaskhost.exe

description pid process

Token: SeDebugPrivilege 3572 taskhosts-cleaned.exe
Token: SeDebugPrivilege 4664 taskhost.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

taskhost.exe

pid process

4664 taskhost.exe

pid	process
2528	schtasks.exe
212	schtasks.exe
3928	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	3572	taskhosts-cleaned.exe
Token: SeDebugPrivilege	4664	taskhost.exe

pid	process
4664	taskhost.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

taskhosts-cleaned.exetaskhost.exe

description	pid	process	target process
PID 3572 wrote to memory of 212	3572	taskhosts-cleaned.exe	schtasks.exe
PID 3572 wrote to memory of 212	3572	taskhosts-cleaned.exe	schtasks.exe
PID 3572 wrote to memory of 212	3572	taskhosts-cleaned.exe	schtasks.exe
PID 3572 wrote to memory of 4664	3572	taskhosts-cleaned.exe	taskhost.exe
PID 3572 wrote to memory of 4664	3572	taskhosts-cleaned.exe	taskhost.exe
PID 3572 wrote to memory of 4664	3572	taskhosts-cleaned.exe	taskhost.exe
PID 4664 wrote to memory of 3928	4664	taskhost.exe	schtasks.exe
PID 4664 wrote to memory of 3928	4664	taskhost.exe	schtasks.exe
PID 4664 wrote to memory of 3928	4664	taskhost.exe	schtasks.exe
PID 4664 wrote to memory of 2528	4664	taskhost.exe	schtasks.exe
PID 4664 wrote to memory of 2528	4664	taskhost.exe	schtasks.exe
PID 4664 wrote to memory of 2528	4664	taskhost.exe	schtasks.exe

C:\Users\Admin\AppData\Local\Temp\taskhosts-cleaned.exe
"C:\Users\Admin\AppData\Local\Temp\taskhosts-cleaned.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3572

C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "EdgeBrowser" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\taskhosts-cleaned.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:212

C:\Windows\SysWOW64\SubDir\taskhost.exe
"C:\Windows\SysWOW64\SubDir\taskhost.exe"
2⤵
- Checks computer location settings
- Executes dropped EXE
- Adds Run key to start application
- Drops autorun.inf file
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4664

C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "EdgeBrowser" /sc ONLOGON /tr "C:\Windows\SysWOW64\SubDir\taskhost.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:3928

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /create /tn "WINDOWSSYSTEMHOST" /tr "C:\Windows\SysWOW64\SubDir\taskhost.exe" /sc MINUTE /MO 1
3⤵
- Creates scheduled task(s)
PID:2528

C:\Windows\SysWOW64\SubDir\taskhost.exe
C:\Windows\SysWOW64\SubDir\taskhost.exe
1⤵
- Executes dropped EXE
PID:1596

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Replication Through Removable Media

1

T1091

Execution

Scheduled Task

1

T1053

Persistence

Registry Run Keys / Startup Folder

1

T1060

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Replication Through Removable Media

1

T1091

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Windows\SysWOW64\SubDir\taskhost.exe
Filesize
385KB

MD5
6e5babe25aad66144dd2e15ab97bd38b

SHA1
61d589a0814a1ef9a0b1a06454f9761fe81ddbff

SHA256
fbbb647aeb0707b5897f74bc3616b275406c6fce1ac0409a6f582fdfcc2de147

SHA512
6547309b05f1ffec63c5ea9c92bb536d37ca1b7104df936324ba19dfb53dff0aa9135f3a9bd4aa0ae46a210048db9b5694424e00bd47e2cb2ab63df5a4f52896

Download Submit
C:\Windows\SysWOW64\SubDir\taskhost.exe
Filesize
385KB

MD5
6e5babe25aad66144dd2e15ab97bd38b

SHA1
61d589a0814a1ef9a0b1a06454f9761fe81ddbff

SHA256
fbbb647aeb0707b5897f74bc3616b275406c6fce1ac0409a6f582fdfcc2de147

SHA512
6547309b05f1ffec63c5ea9c92bb536d37ca1b7104df936324ba19dfb53dff0aa9135f3a9bd4aa0ae46a210048db9b5694424e00bd47e2cb2ab63df5a4f52896

Download Submit
C:\Windows\SysWOW64\SubDir\taskhost.exe
Filesize
385KB

MD5
6e5babe25aad66144dd2e15ab97bd38b

SHA1
61d589a0814a1ef9a0b1a06454f9761fe81ddbff

SHA256
fbbb647aeb0707b5897f74bc3616b275406c6fce1ac0409a6f582fdfcc2de147

SHA512
6547309b05f1ffec63c5ea9c92bb536d37ca1b7104df936324ba19dfb53dff0aa9135f3a9bd4aa0ae46a210048db9b5694424e00bd47e2cb2ab63df5a4f52896

Download Submit
memory/1596-154-0x0000000004EC0000-0x0000000004ED0000-memory.dmp

Filesize
64KB

Download
memory/3572-139-0x0000000002590000-0x00000000025A0000-memory.dmp

Filesize
64KB

Download
memory/3572-138-0x0000000004FD0000-0x0000000004FE2000-memory.dmp

Filesize
72KB

Download
memory/3572-133-0x0000000000050000-0x00000000000B6000-memory.dmp

Filesize
408KB

Download
memory/3572-137-0x0000000004C80000-0x0000000004CE6000-memory.dmp

Filesize
408KB

Download
memory/3572-136-0x0000000002590000-0x00000000025A0000-memory.dmp

Filesize
64KB

Download
memory/3572-135-0x0000000004AE0000-0x0000000004B72000-memory.dmp

Filesize
584KB

Download
memory/3572-134-0x0000000004FF0000-0x0000000005594000-memory.dmp

Filesize
5.6MB

Download
memory/4664-146-0x00000000051B0000-0x00000000051C0000-memory.dmp

Filesize
64KB

Download
memory/4664-147-0x0000000006470000-0x00000000064AC000-memory.dmp

Filesize
240KB

Download
memory/4664-149-0x0000000006EB0000-0x0000000006EBA000-memory.dmp

Filesize
40KB

Download
memory/4664-152-0x00000000051B0000-0x00000000051C0000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads