asyncrat | 992a957c60ea0b948a4ad59cbbfcf101ac3663beb86496271ea9baf1794c15fc

General

Target
tmpxfc_7344.exe
Size 45KB
Sample260602-jmh8dsgt7x
SHA256 992a957c60ea0b948a4ad59cbbfcf101ac3663beb86496271ea9baf1794c15fc
MD5 761135ac975279493910b94fc4337088
SHA1 3c00cb23395059229ddfdecf747db20b3769cc13
SHA512 1b62b83745b602943436647c3fbc201687103a403bb81953f11ee805f73b437be4bef30c15397fb656b456465ad69cbd8470f73596d269803db7ca1584cb1e6e
SSDEEP 768:JuxJNT5UR5rWUX8N5mo2qAHVlcVl6GcPI+zjbBgX334ea7Kmog6bk35NBDZbx:JuxJNT5OU27V2X6Gh+3buXn+7Nog6bEN
TLSH
T14E231B0037E9822BF2BE4F78ADF26146867AF2632603D54A1CC451DB5713FC69A426FD
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

phimsexhayvzz.com:443
phimsexhayvzz.com:80
phimsexhayvzz.com:7797
phimsexhayvzz.com:8707
phimsexhayvzz.com:6620
www.phimsexhayvzz.com:443
www.phimsexhayvzz.com:80
www.phimsexhayvzz.com:7797
www.phimsexhayvzz.com:8707
www.phimsexhayvzz.com:6620
client.phimsexhayvzz.com:443
client.phimsexhayvzz.com:80
client.phimsexhayvzz.com:7797
client.phimsexhayvzz.com:8707
client.phimsexhayvzz.com:6620
connect.phimsexhayvzz.com:443
connect.phimsexhayvzz.com:80
connect.phimsexhayvzz.com:7797
connect.phimsexhayvzz.com:8707
connect.phimsexhayvzz.com:6620

Mutex

jdGbvnJ7LBrK

Attributes

delay
0
install
true
install_file
a59t.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 2 IoCs

rat

resource	yara_rule
behavioral2/files/0x0002000000022c45-8.dat	family_asyncrat
behavioral2/memory/4112-10-0x0000000004B00000-0x0000000004B10000-memory.dmp	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-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	tmpxfc_7344.exe

Executes dropped EXE 2 IoCs

pid	Process
4112	a59t.exe
3804	a59t.exe

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

System Information Discovery
T1082

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	cmd.exe
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	a59t.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a59t.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmpxfc_7344.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
4836	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
2860	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
3500	tmpxfc_7344.exe
3500	tmpxfc_7344.exe
3500	tmpxfc_7344.exe
3500	tmpxfc_7344.exe
3500	tmpxfc_7344.exe
3500	tmpxfc_7344.exe
3500	tmpxfc_7344.exe
3500	tmpxfc_7344.exe
3500	tmpxfc_7344.exe
3500	tmpxfc_7344.exe
3500	tmpxfc_7344.exe
3500	tmpxfc_7344.exe
3500	tmpxfc_7344.exe
3500	tmpxfc_7344.exe
3500	tmpxfc_7344.exe
3500	tmpxfc_7344.exe
3500	tmpxfc_7344.exe
3500	tmpxfc_7344.exe
3500	tmpxfc_7344.exe
3500	tmpxfc_7344.exe
3500	tmpxfc_7344.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3500	tmpxfc_7344.exe
Token: SeDebugPrivilege	4112	a59t.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3500 wrote to memory of 884	3500	tmpxfc_7344.exe	89
PID 3500 wrote to memory of 4136	3500	tmpxfc_7344.exe	91
PID 4136 wrote to memory of 4836	4136	cmd.exe	93
PID 884 wrote to memory of 2860	884	cmd.exe	94
PID 4136 wrote to memory of 3804	4136	cmd.exe	102

C:\Users\Admin\AppData\Local\Temp\tmpxfc_7344.exe
"C:\Users\Admin\AppData\Local\Temp\tmpxfc_7344.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3500
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "a59t" /tr '"C:\Users\Admin\AppData\Roaming\a59t.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:884
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "a59t" /tr '"C:\Users\Admin\AppData\Roaming\a59t.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2860
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp95B3.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4136
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4836
- - C:\Users\Admin\AppData\Roaming\a59t.exe
    "C:\Users\Admin\AppData\Roaming\a59t.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:3804

C:\Users\Admin\AppData\Roaming\a59t.exe
"C:\Users\Admin\AppData\Roaming\a59t.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:4112

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

tmp95B3.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp95B3.tmp.bat
Size 148B
SHA256 ee128a96af2760c24568729365fd54ee2be666d81ecba0066cc1382400b849a5
MD5 d121807e43dd8b8d8dd64a348f219d4b
SHA1 24d40f2746c02d2ffea6d6f058f13e0eb21931b6
SHA512 2a711bbc1a9e7130af3ca2ec6ce9b6680eecd171aab3a2f157b48cf52e6c63bcddea4467288c94adc927704c7debf812b1de2d43c116ef36fe300a71359d348c
TLSH
T19FC02B6251C6EA5E2905541303FED48CE1727C5D3F40BB54C304410D528185CF1DA346
MD5 SHA1 SHA512 TLSH

Submit Download

a59t.exe

Path C:\Users\Admin\AppData\Roaming\a59t.exe
Size 45KB
SHA256 992a957c60ea0b948a4ad59cbbfcf101ac3663beb86496271ea9baf1794c15fc
MD5 761135ac975279493910b94fc4337088
SHA1 3c00cb23395059229ddfdecf747db20b3769cc13
SHA512 1b62b83745b602943436647c3fbc201687103a403bb81953f11ee805f73b437be4bef30c15397fb656b456465ad69cbd8470f73596d269803db7ca1584cb1e6e
SSDEEP 768:JuxJNT5UR5rWUX8N5mo2qAHVlcVl6GcPI+zjbBgX334ea7Kmog6bk35NBDZbx:JuxJNT5OU27V2X6Gh+3buXn+7Nog6bEN
TLSH
T14E231B0037E9822BF2BE4F78ADF26146867AF2632603D54A1CC451DB5713FC69A426FD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3500-0-0x0000000000530000-0x0000000000542000-memory.dmp

Download

memory/3500-1-0x0000000004F70000-0x0000000004F80000-memory.dmp

Download

memory/3500-2-0x0000000004F80000-0x000000000501C000-memory.dmp

Download

memory/4112-10-0x0000000004B00000-0x0000000004B10000-memory.dmp

Download

memory/4112-13-0x0000000004B00000-0x0000000004B10000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads