Malware Analysis Report

2025-04-03 11:29

Sample ID 241109-3a44wavaqg
Target Bootstrapper.exe
SHA256 4744d244bb23331abb4bf35a693bb4354b55285a378bd1db22b13d3e61570c88
Tags
asyncrat victim discovery rat
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

4744d244bb23331abb4bf35a693bb4354b55285a378bd1db22b13d3e61570c88

Threat Level: Known bad

The file Bootstrapper.exe was found to be: Known bad.

Malicious Activity Summary

asyncrat victim discovery rat

Asyncrat family

AsyncRat

Async RAT payload

Async RAT payload

Checks computer location settings

Executes dropped EXE

Enumerates physical storage devices

Unsigned PE

System Location Discovery: System Language Discovery

Scheduled Task/Job: Scheduled Task

Suspicious behavior: EnumeratesProcesses

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Delays execution with timeout.exe

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-09 23:19

Signatures

Async RAT payload

rat
Description Indicator Process Target
N/A N/A N/A N/A

Asyncrat family

asyncrat

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-11-09 23:19

Reported

2024-11-09 23:22

Platform

win10ltsc2021-20241023-en

Max time kernel

143s

Max time network

149s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe"

Signatures

AsyncRat

rat asyncrat

Asyncrat family

asyncrat

Async RAT payload

rat
Description Indicator Process Target
N/A N/A N/A N/A

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-1669812756-2240353048-2660728061-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe N/A

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\timeout.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\schtasks.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\cmd.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\cmd.exe N/A

Delays execution with timeout.exe

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\timeout.exe N/A

Scheduled Task/Job: Scheduled Task

persistence execution
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\schtasks.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1480 wrote to memory of 2012 N/A C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe C:\Windows\SysWOW64\cmd.exe
PID 1480 wrote to memory of 2012 N/A C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe C:\Windows\SysWOW64\cmd.exe
PID 1480 wrote to memory of 2012 N/A C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe C:\Windows\SysWOW64\cmd.exe
PID 1480 wrote to memory of 2016 N/A C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe C:\Windows\SysWOW64\cmd.exe
PID 1480 wrote to memory of 2016 N/A C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe C:\Windows\SysWOW64\cmd.exe
PID 1480 wrote to memory of 2016 N/A C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe C:\Windows\SysWOW64\cmd.exe
PID 2016 wrote to memory of 3136 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 2016 wrote to memory of 3136 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 2016 wrote to memory of 3136 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 2012 wrote to memory of 3220 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 2012 wrote to memory of 3220 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 2012 wrote to memory of 3220 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 2016 wrote to memory of 4576 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe
PID 2016 wrote to memory of 4576 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe
PID 2016 wrote to memory of 4576 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe

Processes

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

"C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe"

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "SysKeeperVLR" /tr '"C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe"' & exit

C:\Windows\SysWOW64\cmd.exe

C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp8B19.tmp.bat""

C:\Windows\SysWOW64\timeout.exe

timeout 3

C:\Windows\SysWOW64\schtasks.exe

schtasks /create /f /sc onlogon /rl highest /tn "SysKeeperVLR" /tr '"C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe"'

C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe

"C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 99.209.201.84.in-addr.arpa udp
US 8.8.8.8:53 149.220.183.52.in-addr.arpa udp
US 8.8.8.8:53 69.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
DE 193.161.193.99:9999 tcp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
US 8.8.8.8:53 56.163.245.4.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
DE 193.161.193.99:9999 tcp
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
US 8.8.8.8:53 71.209.201.84.in-addr.arpa udp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp

Files

memory/1480-0-0x00007FFA208D0000-0x00007FFA20AC8000-memory.dmp

memory/1480-1-0x00000000002D0000-0x00000000002F0000-memory.dmp

memory/1480-2-0x00007FFA208D0000-0x00007FFA20AC8000-memory.dmp

memory/1480-3-0x0000000004D00000-0x0000000004D66000-memory.dmp

memory/1480-4-0x0000000005110000-0x00000000051AC000-memory.dmp

memory/1480-9-0x00007FFA208D0000-0x00007FFA20AC8000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmp8B19.tmp.bat

MD5 f8534dced55b66321566d8e956022083
SHA1 5bebbcebb4a7e4feceac41293ecdd176f3115b49
SHA256 421456e9a60d47c2655c04bc40dee54a0c6c3a5efc3d003c0f1c7c09c313da61
SHA512 6f94e6749664ef5c896814afcfcaded62d87283b0c1c9f3f23b74f412a77bad67f1360deee8e1e88cdb7692f8356921fbe94083d73b61e4b8a11917e30901004

C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe

MD5 c3d1f3320345e4f686f424dfc830d55e
SHA1 a5f901cc9b310c033ef4a8469a691b3b3f22dc58
SHA256 4744d244bb23331abb4bf35a693bb4354b55285a378bd1db22b13d3e61570c88
SHA512 045a68da3a72a8eceedfe72f9dc4256a2ebc80c81e89cbe5da3ca2b958dcd41222edcc3c2c774b7847f91a525c52070a1aa778f62d372f143f87ceafaf4cb46b

memory/4576-14-0x00007FFA208D0000-0x00007FFA20AC8000-memory.dmp

memory/4576-15-0x00007FFA208D0000-0x00007FFA20AC8000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-11-09 23:19

Reported

2024-11-09 23:22

Platform

win11-20241007-en

Max time kernel

145s

Max time network

149s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe"

Signatures

AsyncRat

rat asyncrat

Asyncrat family

asyncrat

Async RAT payload

rat
Description Indicator Process Target
N/A N/A N/A N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe N/A

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\timeout.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\cmd.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\cmd.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\schtasks.exe N/A

Delays execution with timeout.exe

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\timeout.exe N/A

Scheduled Task/Job: Scheduled Task

persistence execution
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\schtasks.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 720 wrote to memory of 2856 N/A C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe C:\Windows\SysWOW64\cmd.exe
PID 720 wrote to memory of 2856 N/A C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe C:\Windows\SysWOW64\cmd.exe
PID 720 wrote to memory of 2856 N/A C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe C:\Windows\SysWOW64\cmd.exe
PID 720 wrote to memory of 1692 N/A C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe C:\Windows\SysWOW64\cmd.exe
PID 720 wrote to memory of 1692 N/A C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe C:\Windows\SysWOW64\cmd.exe
PID 720 wrote to memory of 1692 N/A C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe C:\Windows\SysWOW64\cmd.exe
PID 2856 wrote to memory of 4412 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 2856 wrote to memory of 4412 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 2856 wrote to memory of 4412 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 1692 wrote to memory of 2312 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 1692 wrote to memory of 2312 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 1692 wrote to memory of 2312 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 1692 wrote to memory of 3696 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe
PID 1692 wrote to memory of 3696 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe
PID 1692 wrote to memory of 3696 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe

Processes

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

"C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe"

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "SysKeeperVLR" /tr '"C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe"' & exit

C:\Windows\SysWOW64\cmd.exe

C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp9E92.tmp.bat""

C:\Windows\SysWOW64\schtasks.exe

schtasks /create /f /sc onlogon /rl highest /tn "SysKeeperVLR" /tr '"C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe"'

C:\Windows\SysWOW64\timeout.exe

timeout 3

C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe

"C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe"

Network

Country Destination Domain Proto
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp
DE 193.161.193.99:9999 tcp

Files

memory/720-0-0x0000000074F9E000-0x0000000074F9F000-memory.dmp

memory/720-1-0x0000000000470000-0x0000000000490000-memory.dmp

memory/720-2-0x0000000074F90000-0x0000000075741000-memory.dmp

memory/720-3-0x0000000004EC0000-0x0000000004F26000-memory.dmp

memory/720-4-0x0000000005370000-0x000000000540C000-memory.dmp

memory/720-9-0x0000000074F90000-0x0000000075741000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmp9E92.tmp.bat

MD5 fb693135860e991db6bad055dcce26ec
SHA1 273d18d4458359b7dccc436020105fda3a812438
SHA256 b5b2e1badcf0441a0158210d167f390b166681ebb830a631cae196817b7ea559
SHA512 0bc2abb0e809368bec32dba220575ddac117ebc43d2f2f99b252f69b7d5100585124cbff273724d82bb94967ff79faf02643190cf7d16874f44768511bda3486

C:\Users\Admin\AppData\Roaming\SysKeeperVLR.exe

MD5 c3d1f3320345e4f686f424dfc830d55e
SHA1 a5f901cc9b310c033ef4a8469a691b3b3f22dc58
SHA256 4744d244bb23331abb4bf35a693bb4354b55285a378bd1db22b13d3e61570c88
SHA512 045a68da3a72a8eceedfe72f9dc4256a2ebc80c81e89cbe5da3ca2b958dcd41222edcc3c2c774b7847f91a525c52070a1aa778f62d372f143f87ceafaf4cb46b

memory/3696-14-0x0000000074EE0000-0x0000000075691000-memory.dmp

memory/3696-15-0x0000000074EE0000-0x0000000075691000-memory.dmp