asyncrat | b769aedb94cba85f44862c06da693bfa67576d497fc8371dd3070c6ce1f464ef

General

Target
zxfcsdretert.exe
Size 45KB
Sample260913-cb55fsde96
SHA256 b769aedb94cba85f44862c06da693bfa67576d497fc8371dd3070c6ce1f464ef
MD5 5a48cc290416bd686eab769a58a19b51
SHA1 f627fca6fc91d3a98201a0c09ee04ff674db53ff
SHA512 ebe654a6ad707d134cb9eab858fdefb85036e1db357298e458d2bab0e0e537457a1bdb064988a9483670af88edb4e505acf0791ba8d80546e3d46d8ec88f4c7d
SSDEEP 768:puAwNTR4ydbWUnrGJmo2q7qfH0hEITPIuzjbigX3iySkKe+9kp2yiXxuFRsBDZ7x:puAwNTRZ22JM38u3bFXSyS191Td7x
TLSH
T11C232B003BE8812BF2BE5F78A8F26105867AF2676603D54E2CC451DB5613FC6D6426FE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

admin command_and_control defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Admin

C2

phimsexxxx.net:80
phimsexxxx.net:443
phimsexxxx.net:7788
phimsexxxx.net:7879
phimsexxxx.net:3577
phimsexxxx.net:8888
phimsexxxx.net:3306
phimsexxxx.net:21
phimsexxxx.net:22
www.phimsexxxx.net:80
www.phimsexxxx.net:443
www.phimsexxxx.net:7788
www.phimsexxxx.net:7879
www.phimsexxxx.net:3577
www.phimsexxxx.net:8888
www.phimsexxxx.net:3306
www.phimsexxxx.net:21
www.phimsexxxx.net:22

Mutex

OdjnQgdmXrf2

Attributes

delay
3
install
true
install_file
zxfcsdretert.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/0x00080000000004ec-9.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-1-5-21-1846164713-4096795028-774071693-1000\Control Panel\International\Geo\Nation	zxfcsdretert.exe

Executes dropped EXE 2 IoCs

pid	Process
4412	zxfcsdretert.exe
1308	zxfcsdretert.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	22	172.67.167.47:22	4412	zxfcsdretert.exe
SSH destination	37	104.21.16.91:22	4412	zxfcsdretert.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
4520	cmd.exe
628	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	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	zxfcsdretert.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	zxfcsdretert.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	zxfcsdretert.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1736	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
2636	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
3820	zxfcsdretert.exe
3820	zxfcsdretert.exe
3820	zxfcsdretert.exe
3820	zxfcsdretert.exe
3820	zxfcsdretert.exe
3820	zxfcsdretert.exe
3820	zxfcsdretert.exe
3820	zxfcsdretert.exe
3820	zxfcsdretert.exe
3820	zxfcsdretert.exe
3820	zxfcsdretert.exe
3820	zxfcsdretert.exe
3820	zxfcsdretert.exe
3820	zxfcsdretert.exe
3820	zxfcsdretert.exe
3820	zxfcsdretert.exe
3820	zxfcsdretert.exe
3820	zxfcsdretert.exe
3820	zxfcsdretert.exe
3820	zxfcsdretert.exe
3820	zxfcsdretert.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3820	zxfcsdretert.exe
Token: SeDebugPrivilege	4412	zxfcsdretert.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3820 wrote to memory of 4520	3820	zxfcsdretert.exe	88
PID 3820 wrote to memory of 628	3820	zxfcsdretert.exe	90
PID 4520 wrote to memory of 2636	4520	cmd.exe	92
PID 628 wrote to memory of 1736	628	cmd.exe	93
PID 628 wrote to memory of 1308	628	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\zxfcsdretert.exe
"C:\Users\Admin\AppData\Local\Temp\zxfcsdretert.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3820
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "zxfcsdretert" /tr '"C:\Users\Admin\AppData\Roaming\zxfcsdretert.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4520
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "zxfcsdretert" /tr '"C:\Users\Admin\AppData\Roaming\zxfcsdretert.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2636
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpC35B.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:628
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1736
- - C:\Users\Admin\AppData\Roaming\zxfcsdretert.exe
    "C:\Users\Admin\AppData\Roaming\zxfcsdretert.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1308

C:\Users\Admin\AppData\Roaming\zxfcsdretert.exe
"C:\Users\Admin\AppData\Roaming\zxfcsdretert.exe"
1⤵
- Executes dropped EXE
- Outbound SSH connection to public host
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:4412

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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Downloads

zxfcsdretert.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\zxfcsdretert.exe.log
Size 522B
SHA256 2412679218bb0a7d05ceee32869bbb223619bde9966c4c460a68304a3367724b
MD5 acc9090417037dfa2a55b46ed86e32b8
SHA1 53fa6fb25fb3e88c24d2027aca6ae492b2800a4d
SHA512 d51f7085ec147c708f446b9fb6923cd2fb64596d354ed929e125b30ace57c8cb3217589447a36960e5d3aea87a4e48aaa82c7509eced6d6c2cecd71fcfe3697b
TLSH
T11EF097303722E1E489423F521C1C3A9943EF079AA360EE2C3958036ED825227AB212E3
MD5 SHA1 SHA512 TLSH

Submit Download

tmpC35B.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpC35B.tmp.bat
Size 156B
SHA256 73d6b1ecbba65ced7a8679e7115cd860953eb0b668650637a0660a15cdb5de65
MD5 389462b9a9af3e522e273b49150dacad
SHA1 cd7af72bee79b0a36ad37cdaae8eed395491a3b1
SHA512 5d1aab3bd14d6965c77e864c596e47cad4b9addc63cc53db1d22bcf706d3755543d7c84f7113b5d5c4aad9049f8c14e65957c9d5b690d3cd0df0727f402a25a6
TLSH
T1D5C08C4299C6AA4E6989942302BAE89CB1A66C2A3F80BB40C3884009568184CE099281
MD5 SHA1 SHA512 TLSH

Submit Download

zxfcsdretert.exe

Path C:\Users\Admin\AppData\Roaming\zxfcsdretert.exe
Size 45KB
SHA256 b769aedb94cba85f44862c06da693bfa67576d497fc8371dd3070c6ce1f464ef
MD5 5a48cc290416bd686eab769a58a19b51
SHA1 f627fca6fc91d3a98201a0c09ee04ff674db53ff
SHA512 ebe654a6ad707d134cb9eab858fdefb85036e1db357298e458d2bab0e0e537457a1bdb064988a9483670af88edb4e505acf0791ba8d80546e3d46d8ec88f4c7d
SSDEEP 768:puAwNTR4ydbWUnrGJmo2q7qfH0hEITPIuzjbigX3iySkKe+9kp2yiXxuFRsBDZ7x:puAwNTRZ22JM38u3bFXSyS191Td7x
TLSH
T11C232B003BE8812BF2BE5F78A8F26105867AF2676603D54E2CC451DB5613FC6D6426FE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3820-0-0x0000000000E80000-0x0000000000E92000-memory.dmp

Download

memory/3820-1-0x0000000005850000-0x0000000005860000-memory.dmp

Download

memory/3820-2-0x0000000005900000-0x000000000599C000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads