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 6 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1128-54-0x0000000000190000-0x00000000001F6000-memory.dmp	family_quasar
\Windows\SysWOW64\SubDir\taskhost.exe	family_quasar
C:\Windows\SysWOW64\SubDir\taskhost.exe	family_quasar
C:\Windows\SysWOW64\SubDir\taskhost.exe	family_quasar
behavioral1/memory/1376-63-0x0000000000290000-0x00000000002F6000-memory.dmp	family_quasar
C:\Windows\SysWOW64\SubDir\taskhost.exe	family_quasar

Executes dropped EXE 2 IoCs

Processes:

taskhost.exetaskhost.exe

pid process

1376 taskhost.exe
1104 taskhost.exe
Loads dropped DLL 1 IoCs

Processes:

taskhosts-cleaned.exe

pid process

1128 taskhosts-cleaned.exe

pid	process
1376	taskhost.exe
1104	taskhost.exe

pid	process
1128	taskhosts-cleaned.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-1-5-21-3465915139-4244146034-2076118314-1000\Software\Microsoft\Windows\CurrentVersion\Run\EdgeBrowser = "\"C:\\Windows\\SysWOW64\\SubDir\\taskhost.exe\""	taskhost.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

1 ip-api.com
Drops autorun.inf file 1 TTPs 1 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

flow	ioc
1	ip-api.com

description	ioc	process
File created	C:\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

1844 schtasks.exe
268 schtasks.exe
860 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

taskhosts-cleaned.exetaskhost.exe

description pid process

Token: SeDebugPrivilege 1128 taskhosts-cleaned.exe
Token: SeDebugPrivilege 1376 taskhost.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

taskhost.exe

pid process

1376 taskhost.exe

pid	process
1844	schtasks.exe
268	schtasks.exe
860	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	1128	taskhosts-cleaned.exe
Token: SeDebugPrivilege	1376	taskhost.exe

pid	process
1376	taskhost.exe

Suspicious use of WriteProcessMemory 20 IoCs

Processes:

taskhosts-cleaned.exetaskhost.exetaskeng.exe

description	pid	process	target process
PID 1128 wrote to memory of 268	1128	taskhosts-cleaned.exe	schtasks.exe
PID 1128 wrote to memory of 268	1128	taskhosts-cleaned.exe	schtasks.exe
PID 1128 wrote to memory of 268	1128	taskhosts-cleaned.exe	schtasks.exe
PID 1128 wrote to memory of 268	1128	taskhosts-cleaned.exe	schtasks.exe
PID 1128 wrote to memory of 1376	1128	taskhosts-cleaned.exe	taskhost.exe
PID 1128 wrote to memory of 1376	1128	taskhosts-cleaned.exe	taskhost.exe
PID 1128 wrote to memory of 1376	1128	taskhosts-cleaned.exe	taskhost.exe
PID 1128 wrote to memory of 1376	1128	taskhosts-cleaned.exe	taskhost.exe
PID 1376 wrote to memory of 860	1376	taskhost.exe	schtasks.exe
PID 1376 wrote to memory of 860	1376	taskhost.exe	schtasks.exe
PID 1376 wrote to memory of 860	1376	taskhost.exe	schtasks.exe
PID 1376 wrote to memory of 860	1376	taskhost.exe	schtasks.exe
PID 1376 wrote to memory of 1844	1376	taskhost.exe	schtasks.exe
PID 1376 wrote to memory of 1844	1376	taskhost.exe	schtasks.exe
PID 1376 wrote to memory of 1844	1376	taskhost.exe	schtasks.exe
PID 1376 wrote to memory of 1844	1376	taskhost.exe	schtasks.exe
PID 788 wrote to memory of 1104	788	taskeng.exe	taskhost.exe
PID 788 wrote to memory of 1104	788	taskeng.exe	taskhost.exe
PID 788 wrote to memory of 1104	788	taskeng.exe	taskhost.exe
PID 788 wrote to memory of 1104	788	taskeng.exe	taskhost.exe

C:\Users\Admin\AppData\Local\Temp\taskhosts-cleaned.exe
"C:\Users\Admin\AppData\Local\Temp\taskhosts-cleaned.exe"
1⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1128
- 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:268
- C:\Windows\SysWOW64\SubDir\taskhost.exe
  "C:\Windows\SysWOW64\SubDir\taskhost.exe"
  2⤵
  - 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:1376
- - 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:860
- - 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:1844

C:\Windows\system32\taskeng.exe
taskeng.exe {010FFB7F-67B9-4862-B878-646BEFCC2C67} S-1-5-21-3465915139-4244146034-2076118314-1000:MSOKFDFP\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:788
- C:\Windows\SysWOW64\SubDir\taskhost.exe
  C:\Windows\SysWOW64\SubDir\taskhost.exe
  2⤵
  - Executes dropped EXE
  PID:1104

Network

MITRE ATT&CK Enterprise v6

Initial Access

Replication Through Removable Media

1

T1091

Execution

Scheduled Task

1

T1053

Persistence

Registry Run Keys / Startup Folder

Scheduled Task

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Replication Through Removable Media

1

T1091

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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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
\Windows\SysWOW64\SubDir\taskhost.exe

Filesize
385KB

MD5
6e5babe25aad66144dd2e15ab97bd38b

SHA1
61d589a0814a1ef9a0b1a06454f9761fe81ddbff

SHA256
fbbb647aeb0707b5897f74bc3616b275406c6fce1ac0409a6f582fdfcc2de147

SHA512
6547309b05f1ffec63c5ea9c92bb536d37ca1b7104df936324ba19dfb53dff0aa9135f3a9bd4aa0ae46a210048db9b5694424e00bd47e2cb2ab63df5a4f52896

Download Submit
memory/1104-67-0x0000000004A40000-0x0000000004A80000-memory.dmp

Filesize
256KB

Download
memory/1128-54-0x0000000000190000-0x00000000001F6000-memory.dmp

Filesize
408KB

Download
memory/1128-55-0x0000000004CA0000-0x0000000004CE0000-memory.dmp

Filesize
256KB

Download
memory/1376-63-0x0000000000290000-0x00000000002F6000-memory.dmp

Filesize
408KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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