Malware Analysis Report

2024-08-06 13:13

Sample ID 240616-svbyqaserk
Target cum.exe
SHA256 97ef8ed044f3e29f2d56193a52aa607e33eb990210cea4cdac6fbf7285fc733d
Tags
rat default asyncrat
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

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

97ef8ed044f3e29f2d56193a52aa607e33eb990210cea4cdac6fbf7285fc733d

Threat Level: Known bad

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

Malicious Activity Summary

rat default asyncrat

Asyncrat family

AsyncRat

Async RAT payload

Async RAT payload

Executes dropped EXE

Checks computer location settings

Loads dropped DLL

Unsigned PE

Enumerates physical storage devices

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Creates scheduled task(s)

Delays execution with timeout.exe

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK Matrix V13

Initial Access
TA0001
Execution
TA0002
Scheduled Task/Job
T1053
Persistence
TA0003
Scheduled Task/Job
T1053
Privilege Escalation
TA0004
Scheduled Task/Job
T1053
Defense Evasion
TA0005
Credential Access
TA0006
Discovery
TA0007
System Information Discovery
T1082
Query Registry
T1012
Lateral Movement
TA0008
Collection
TA0009
Exfiltration
TA0010
Command and Control
TA0011
Impact
TA0040
Resource Development
TA0042
Reconnaissance
TA0043

Analysis: static1

Detonation Overview

Reported

2024-06-16 15:26

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

2024-06-16 15:26

Reported

2024-06-16 15:29

Platform

win7-20240508-en

Max time kernel

146s

Max time network

149s

Command Line

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

Signatures

AsyncRat

rat 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\RAR.exe N/A

Loads dropped DLL

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

Enumerates physical storage devices

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A 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

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A

Suspicious use of AdjustPrivilegeToken

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1688 wrote to memory of 1864 N/A C:\Users\Admin\AppData\Local\Temp\cum.exe C:\Windows\SysWOW64\cmd.exe
PID 1688 wrote to memory of 1864 N/A C:\Users\Admin\AppData\Local\Temp\cum.exe C:\Windows\SysWOW64\cmd.exe
PID 1688 wrote to memory of 1864 N/A C:\Users\Admin\AppData\Local\Temp\cum.exe C:\Windows\SysWOW64\cmd.exe
PID 1688 wrote to memory of 1864 N/A C:\Users\Admin\AppData\Local\Temp\cum.exe C:\Windows\SysWOW64\cmd.exe
PID 1688 wrote to memory of 2320 N/A C:\Users\Admin\AppData\Local\Temp\cum.exe C:\Windows\SysWOW64\cmd.exe
PID 1688 wrote to memory of 2320 N/A C:\Users\Admin\AppData\Local\Temp\cum.exe C:\Windows\SysWOW64\cmd.exe
PID 1688 wrote to memory of 2320 N/A C:\Users\Admin\AppData\Local\Temp\cum.exe C:\Windows\SysWOW64\cmd.exe
PID 1688 wrote to memory of 2320 N/A C:\Users\Admin\AppData\Local\Temp\cum.exe C:\Windows\SysWOW64\cmd.exe
PID 2320 wrote to memory of 2732 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 2320 wrote to memory of 2732 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 2320 wrote to memory of 2732 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 2320 wrote to memory of 2732 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 1864 wrote to memory of 2736 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 1864 wrote to memory of 2736 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 1864 wrote to memory of 2736 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 1864 wrote to memory of 2736 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 2320 wrote to memory of 2520 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\RAR.exe
PID 2320 wrote to memory of 2520 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\RAR.exe
PID 2320 wrote to memory of 2520 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\RAR.exe
PID 2320 wrote to memory of 2520 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\RAR.exe

Processes

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

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

C:\Windows\SysWOW64\cmd.exe

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

C:\Windows\SysWOW64\cmd.exe

cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp4106.tmp.bat""

C:\Windows\SysWOW64\timeout.exe

timeout 3

C:\Windows\SysWOW64\schtasks.exe

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

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

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

Network

Country Destination Domain Proto
N/A 172.16.0.64:6606 tcp
N/A 10.6.0.86:7707 tcp
N/A 172.16.0.64:6606 tcp
N/A 10.6.0.86:7707 tcp
N/A 172.16.0.64:6606 tcp
N/A 192.168.0.118:7707 tcp

Files

memory/1688-0-0x00000000744FE000-0x00000000744FF000-memory.dmp

memory/1688-1-0x0000000000A10000-0x0000000000A22000-memory.dmp

memory/1688-2-0x00000000744F0000-0x0000000074BDE000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmp4106.tmp.bat

MD5 73a1dc813428c055a92d9b49b7715c13
SHA1 82ca04fd0093a360df14c2fb72b349caa5833b93
SHA256 e7f3ef7dcd13f53ac3b12bf2e7c7723aea8440d7130692dd55de0841d6f91d5f
SHA512 81acf2bbaf3f94cadcff770d0dccc9766801a56a489978e0b4ea7bc6e446af9fc2c8c57308e500d6e299a78e1ab4e2ac9328351c731d70112a78abd80fd957a7

memory/1688-11-0x00000000744F0000-0x0000000074BDE000-memory.dmp

\Users\Admin\AppData\Roaming\RAR.exe

MD5 910e4d86c5f28a323866c143789749db
SHA1 f8403807b7eb02a4a4021675c7a3d4aefc975527
SHA256 97ef8ed044f3e29f2d56193a52aa607e33eb990210cea4cdac6fbf7285fc733d
SHA512 8c577c27c82f7c75ca8abf8879463e86917a077e39d45a720bbd84d670f82c41b61041c99b22d3bc6738c42260a9ca0e8e6c65c1f93eafd5a529ce26dd31ebe9

memory/2520-16-0x0000000001040000-0x0000000001052000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-16 15:26

Reported

2024-06-16 15:29

Platform

win10v2004-20240611-en

Max time kernel

146s

Max time network

150s

Command Line

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

Signatures

AsyncRat

rat 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-1-5-21-4204450073-1267028356-951339405-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\cum.exe N/A

Executes dropped EXE

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

Enumerates physical storage devices

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A 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

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\cum.exe N/A

Suspicious use of AdjustPrivilegeToken

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4212 wrote to memory of 1480 N/A C:\Users\Admin\AppData\Local\Temp\cum.exe C:\Windows\SysWOW64\cmd.exe
PID 4212 wrote to memory of 1480 N/A C:\Users\Admin\AppData\Local\Temp\cum.exe C:\Windows\SysWOW64\cmd.exe
PID 4212 wrote to memory of 1480 N/A C:\Users\Admin\AppData\Local\Temp\cum.exe C:\Windows\SysWOW64\cmd.exe
PID 4212 wrote to memory of 3916 N/A C:\Users\Admin\AppData\Local\Temp\cum.exe C:\Windows\SysWOW64\cmd.exe
PID 4212 wrote to memory of 3916 N/A C:\Users\Admin\AppData\Local\Temp\cum.exe C:\Windows\SysWOW64\cmd.exe
PID 4212 wrote to memory of 3916 N/A C:\Users\Admin\AppData\Local\Temp\cum.exe C:\Windows\SysWOW64\cmd.exe
PID 1480 wrote to memory of 4940 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 1480 wrote to memory of 4940 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 1480 wrote to memory of 4940 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 3916 wrote to memory of 4148 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 3916 wrote to memory of 4148 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 3916 wrote to memory of 4148 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 3916 wrote to memory of 4024 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\RAR.exe
PID 3916 wrote to memory of 4024 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\RAR.exe
PID 3916 wrote to memory of 4024 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\RAR.exe

Processes

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

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

C:\Windows\SysWOW64\cmd.exe

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

C:\Windows\SysWOW64\cmd.exe

C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp5880.tmp.bat""

C:\Windows\SysWOW64\schtasks.exe

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

C:\Windows\SysWOW64\timeout.exe

timeout 3

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

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.237:443 g.bing.com tcp
NL 23.62.61.194:443 www.bing.com tcp
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 0.204.248.87.in-addr.arpa udp
US 8.8.8.8:53 194.61.62.23.in-addr.arpa udp
US 8.8.8.8:53 205.47.74.20.in-addr.arpa udp
N/A 172.16.0.64:6606 tcp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
US 8.8.8.8:53 49.251.17.2.in-addr.arpa udp
N/A 172.16.0.64:6606 tcp
US 8.8.8.8:53 100.58.20.217.in-addr.arpa udp
N/A 10.6.0.86:7707 tcp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
N/A 172.16.0.64:6606 tcp
US 8.8.8.8:53 14.227.111.52.in-addr.arpa udp
N/A 192.168.0.118:8808 tcp
N/A 10.6.0.86:7707 tcp

Files

memory/4212-0-0x00000000747AE000-0x00000000747AF000-memory.dmp

memory/4212-1-0x0000000000D00000-0x0000000000D12000-memory.dmp

memory/4212-2-0x00000000747A0000-0x0000000074F50000-memory.dmp

memory/4212-3-0x0000000005750000-0x00000000057EC000-memory.dmp

memory/4212-8-0x00000000747A0000-0x0000000074F50000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmp5880.tmp.bat

MD5 36f54b06b50c45e1222347db6efb96b3
SHA1 f59ca1b47e96a6324fac308ce44b680096be62d0
SHA256 3bfbe9d3523bd1c04a01e5a028892f5895e92f2bf9c3153dd88a294e52ee87e5
SHA512 c00b7fe806b672b764bc79e7b78304449a1a25bb7f85d0587bccbf4599ae67b24a6e3958f34ef7c9a42df9e6ed95e88173c07dd37243809579db17a60ebb753b

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

MD5 910e4d86c5f28a323866c143789749db
SHA1 f8403807b7eb02a4a4021675c7a3d4aefc975527
SHA256 97ef8ed044f3e29f2d56193a52aa607e33eb990210cea4cdac6fbf7285fc733d
SHA512 8c577c27c82f7c75ca8abf8879463e86917a077e39d45a720bbd84d670f82c41b61041c99b22d3bc6738c42260a9ca0e8e6c65c1f93eafd5a529ce26dd31ebe9

memory/4024-13-0x00000000746F0000-0x0000000074EA0000-memory.dmp

memory/4024-14-0x00000000746F0000-0x0000000074EA0000-memory.dmp