asyncrat | b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5

General

Target
b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
Size 45KB
Sample260802-tkpx9sstcx
SHA256 b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5
MD5 7e22a2a69de4a7acde8a02cd35f83221
SHA1 feac1deb4fadc0a67654507be076a3c49da5dd47
SHA512 e3bbcc15c4f4a4c6189c7fe43068fc455cf11b010b3da3b45c06355790155271a97aca8a9e87bd3c73c72f0be4aefb9a823664034fef638560a0048cc722a08c
SSDEEP 768:kuSOpTPTCFcWUeXa6mo2qAaLiE0yFjrdj3kk8PIhxjb8gX3iUIPyALjjaTABDZMx:kuSOpTPOP2KLBXDBhhbTXSUIPVv26dMx
TLSH
T150232B0037E9C12BF2BF4F7859F26145867AF6732603D6891C8451DB5723BC68A42AFE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default command_and_control defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

fimsexvietnam.com:80
fimsexvietnam.com:22
fimsexvietnam.com:8080
fimsexvietnam.com:8880
fimsexvietnam.com:2052
fimsexvietnam.com:2082
fimsexvietnam.com:2086
fimsexvietnam.com:2095
fimsexvietnam.com:443
fimsexvietnam.com:2053
fimsexvietnam.com:2083
fimsexvietnam.com:2087
fimsexvietnam.com:2096
fimsexvietnam.com:8443
www.fimsexvietnam.com:80
www.fimsexvietnam.com:22
www.fimsexvietnam.com:8080
www.fimsexvietnam.com:8880
www.fimsexvietnam.com:2052
www.fimsexvietnam.com:2082
www.fimsexvietnam.com:2086
www.fimsexvietnam.com:2095
www.fimsexvietnam.com:443
www.fimsexvietnam.com:2053
www.fimsexvietnam.com:2083
www.fimsexvietnam.com:2087
www.fimsexvietnam.com:2096
www.fimsexvietnam.com:8443
mydoom.fimsexvietnam.com:80
mydoom.fimsexvietnam.com:22
mydoom.fimsexvietnam.com:8080
mydoom.fimsexvietnam.com:8880
mydoom.fimsexvietnam.com:2052
mydoom.fimsexvietnam.com:2082
mydoom.fimsexvietnam.com:2086
mydoom.fimsexvietnam.com:2095
mydoom.fimsexvietnam.com:443
mydoom.fimsexvietnam.com:2053
mydoom.fimsexvietnam.com:2083
mydoom.fimsexvietnam.com:2087
mydoom.fimsexvietnam.com:2096
mydoom.fimsexvietnam.com:8443
malware.fimsexvietnam.com:80
malware.fimsexvietnam.com:22
malware.fimsexvietnam.com:8080
malware.fimsexvietnam.com:8880
malware.fimsexvietnam.com:2052
malware.fimsexvietnam.com:2082
malware.fimsexvietnam.com:2086
malware.fimsexvietnam.com:2095
malware.fimsexvietnam.com:443
malware.fimsexvietnam.com:2053
malware.fimsexvietnam.com:2083
malware.fimsexvietnam.com:2087
malware.fimsexvietnam.com:2096
malware.fimsexvietnam.com:8443
sasser.fimsexvietnam.com:80
sasser.fimsexvietnam.com:22
sasser.fimsexvietnam.com:8080
sasser.fimsexvietnam.com:8880
sasser.fimsexvietnam.com:2052
sasser.fimsexvietnam.com:2082
sasser.fimsexvietnam.com:2086
sasser.fimsexvietnam.com:2095
sasser.fimsexvietnam.com:443
sasser.fimsexvietnam.com:2053
sasser.fimsexvietnam.com:2083
sasser.fimsexvietnam.com:2087
sasser.fimsexvietnam.com:2096
sasser.fimsexvietnam.com:8443

Mutex

nGKsXNWgDzPo

Attributes

delay
0
install
true
install_file
m6c8.exe
install_folder
%AppData%

aes.plain

Signatures

Family: AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x000300000001e6a4-8.dat	family_asyncrat

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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe

Executes dropped EXE 2 IoCs

pid	Process
784	m6c8.exe
4032	m6c8.exe

Outbound SSH connection to public host 2 TTPs 2 IoCs

SSH is used for remote access. This may indicate SSH host discovery, encrypted C2 traffic, or data exfiltration.

command_and_control

Protocol Tunneling

T1572

Network Service Discovery

T1046

description	flow	ioc	pid	Process
SSH destination	41	104.21.36.7:22	784	m6c8.exe
SSH destination	45	172.67.182.173:22	784	m6c8.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 2 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
4916	cmd.exe
4016	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	m6c8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	m6c8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
952	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
1784	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
Token: SeDebugPrivilege	784	m6c8.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4124 wrote to memory of 4916	4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe	88
PID 4124 wrote to memory of 4016	4124	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe	90
PID 4016 wrote to memory of 952	4016	cmd.exe	92
PID 4916 wrote to memory of 1784	4916	cmd.exe	93
PID 4016 wrote to memory of 4032	4016	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
"C:\Users\Admin\AppData\Local\Temp\b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4124
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "m6c8" /tr '"C:\Users\Admin\AppData\Roaming\m6c8.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4916
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "m6c8" /tr '"C:\Users\Admin\AppData\Roaming\m6c8.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1784
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp4198.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4016
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:952
- - C:\Users\Admin\AppData\Roaming\m6c8.exe
    "C:\Users\Admin\AppData\Roaming\m6c8.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4032

C:\Users\Admin\AppData\Roaming\m6c8.exe
"C:\Users\Admin\AppData\Roaming\m6c8.exe"
1⤵
- Executes dropped EXE
- Outbound SSH connection to public host
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:784

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Network Service Discovery

Query Registry

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Protocol Tunneling

1

T1572

Exfiltration

Impact

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tmp4198.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp4198.tmp.bat
Size 148B
SHA256 cd1bb3caf4be0bb57de2f3649b7bede00cab2b9f2e71b8441afe5140212679a2
MD5 c748754c7736048a028e011fbfc580f2
SHA1 1eb71fcf9aa1adb4d9a84a764dd56fe2d89ba41a
SHA512 c37909fe3dffc396be5110f0dfc8a7f3ce6299fe3aec639cbb905c3cb234d9aef092e4704f3e4ab3fe6f211ce58fae98e760412a8f32f0cb44104d3a9c991f06
TLSH
T1FCC02B6352C5EA8E2805281306FAD49C91B26C1D3F84FBA0D704444D1280858F0DB341
MD5 SHA1 SHA512 TLSH

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m6c8.exe

Path C:\Users\Admin\AppData\Roaming\m6c8.exe
Size 45KB
SHA256 b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5
MD5 7e22a2a69de4a7acde8a02cd35f83221
SHA1 feac1deb4fadc0a67654507be076a3c49da5dd47
SHA512 e3bbcc15c4f4a4c6189c7fe43068fc455cf11b010b3da3b45c06355790155271a97aca8a9e87bd3c73c72f0be4aefb9a823664034fef638560a0048cc722a08c
SSDEEP 768:kuSOpTPTCFcWUeXa6mo2qAaLiE0yFjrdj3kk8PIhxjb8gX3iUIPyALjjaTABDZMx:kuSOpTPOP2KLBXDBhhbTXSUIPVv26dMx
TLSH
T150232B0037E9C12BF2BF4F7859F26145867AF6732603D6891C8451DB5723BC68A42AFE
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/784-10-0x0000000005310000-0x0000000005320000-memory.dmp

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memory/784-13-0x0000000005310000-0x0000000005320000-memory.dmp

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memory/4124-0-0x00000000006C0000-0x00000000006D2000-memory.dmp

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memory/4124-1-0x00000000051F0000-0x0000000005200000-memory.dmp

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memory/4124-2-0x00000000050B0000-0x000000000514C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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