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 1 IoCs

rat

resource	yara_rule
behavioral3/files/0x001d00000002b519-8.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
4308	a59t.exe
1396	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a59t.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
2416	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
1064	schtasks.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
1944	tmpxfc_7344.exe
1944	tmpxfc_7344.exe
1944	tmpxfc_7344.exe
1944	tmpxfc_7344.exe
1944	tmpxfc_7344.exe
1944	tmpxfc_7344.exe
1944	tmpxfc_7344.exe
1944	tmpxfc_7344.exe
1944	tmpxfc_7344.exe
1944	tmpxfc_7344.exe
1944	tmpxfc_7344.exe
1944	tmpxfc_7344.exe
1944	tmpxfc_7344.exe
1944	tmpxfc_7344.exe
1944	tmpxfc_7344.exe
1944	tmpxfc_7344.exe
1944	tmpxfc_7344.exe
1944	tmpxfc_7344.exe
1944	tmpxfc_7344.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1944	tmpxfc_7344.exe
Token: SeDebugPrivilege	4308	a59t.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 1944 wrote to memory of 4268	1944	tmpxfc_7344.exe	82
PID 1944 wrote to memory of 4644	1944	tmpxfc_7344.exe	84
PID 4268 wrote to memory of 1064	4268	cmd.exe	86
PID 4644 wrote to memory of 2416	4644	cmd.exe	87
PID 4644 wrote to memory of 1396	4644	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\tmpxfc_7344.exe
"C:\Users\Admin\AppData\Local\Temp\tmpxfc_7344.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1944
- 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:4268
- - 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:1064
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp39E7.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4644
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2416
- - 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:1396

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:4308

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

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tmp39E7.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp39E7.tmp.bat
Size 148B
SHA256 dc82433960a08dc81358b1e5e080f1e0f63726aa748e41824a9077a0b9f692c3
MD5 440569792cfad153c20f93732b2f5d8f
SHA1 8a7bfc6da2f9d2f19fb7fc436940c716a8664002
SHA512 1f350a58f97d5a406a62ee3ad86a69f17724e642dd6ede4d55002d579569f2aa1a67b9cbaaf5c47472da285e00accc1de6da6f162bc1cd8ae765df4874b81c5b
TLSH
T1B6C02B5261C6EB5F2D05541302FAD88CA1766D193F40BB44C704400D628184CF0DA342
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/1944-0-0x0000000000320000-0x0000000000332000-memory.dmp

Download

memory/1944-1-0x0000000004E30000-0x0000000004E40000-memory.dmp

Download

memory/1944-2-0x0000000004E40000-0x0000000004EDC000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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