asyncrat | 4643a65fbe48cb8d17b33aea46ffb8d33ae1e7497dcfffe1715cb93010abd4bf

General

Target

4643a65fbe48cb8d17b33aea46ffb8d33ae1e7497dcfffe1715cb93010abd4bf.exe
Size

2.0MB
MD5

1ebc277fc5893971a3c010fe7cbf644f
SHA1

8444279fee95bebfbf882134962a1afaa16f0b45
SHA256

4643a65fbe48cb8d17b33aea46ffb8d33ae1e7497dcfffe1715cb93010abd4bf
SHA512

86f0df5d10925440b6fc5ec9b0cc723f7babb6d8a04d93f9878ebcb3044ab1f40b07b2c54d659092088f870e331dffc69eea9aa2ddedd8cd27374320d46ecfd4
SSDEEP

24576:qEjTWrDgjlTiiQud5Jg1zC+VfsPprIghtNZ26D2dXdsjdzglySX:sr0jZiiV5CtC4fsprltNZ26DKsRoX

Score

10^/10

asyncrat default discovery rat upx

Malware Config

Extracted

Family

asyncrat

Botnet

Default

C2

allay.x3322.net:5050

Mutex

gnrfjlujxmukjuvrs

Attributes

delay
1
install
true
install_file
WriteFile.exe
install_folder
%AppData%

aes.plain

Signatures

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

VenomRAT 4 IoCs

Detects VenomRAT.

rat

resource	yara_rule
behavioral2/memory/1088-0-0x0000000000400000-0x0000000000646000-memory.dmp	VenomRAT
behavioral2/files/0x000300000001e746-7.dat	VenomRAT
behavioral2/memory/3576-15-0x0000000000870000-0x0000000000888000-memory.dmp	VenomRAT
behavioral2/memory/1088-29-0x0000000000400000-0x0000000000646000-memory.dmp	VenomRAT

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x000300000001e746-7.dat	family_asyncrat

Checks computer location settings 2 TTPs 2 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-1-5-21-786284298-625481688-3210388970-1000\Control Panel\International\Geo\Nation	4643a65fbe48cb8d17b33aea46ffb8d33ae1e7497dcfffe1715cb93010abd4bf.exe
Key value queried	\REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 2 IoCs

pid	Process
3576	Client.exe
3304	WriteFile.exe

UPX packed file 2 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/1088-2-0x0000000000950000-0x000000000095F000-memory.dmp	upx
behavioral2/memory/1088-1-0x0000000068CD0000-0x0000000068CDF000-memory.dmp	upx

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4644	1088	WerFault.exe	83

System Location Discovery: System Language Discovery 1 TTPs 1 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	4643a65fbe48cb8d17b33aea46ffb8d33ae1e7497dcfffe1715cb93010abd4bf.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3628	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
368	schtasks.exe

Suspicious behavior: EnumeratesProcesses 29 IoCs

pid	Process
1088	4643a65fbe48cb8d17b33aea46ffb8d33ae1e7497dcfffe1715cb93010abd4bf.exe
1088	4643a65fbe48cb8d17b33aea46ffb8d33ae1e7497dcfffe1715cb93010abd4bf.exe
3576	Client.exe
3576	Client.exe
3576	Client.exe
3576	Client.exe
3576	Client.exe
3576	Client.exe
3576	Client.exe
3576	Client.exe
3576	Client.exe
3576	Client.exe
3576	Client.exe
3576	Client.exe
3576	Client.exe
3576	Client.exe
3576	Client.exe
3576	Client.exe
3576	Client.exe
3576	Client.exe
3576	Client.exe
3576	Client.exe
3576	Client.exe
3304	WriteFile.exe
3304	WriteFile.exe
3304	WriteFile.exe
3304	WriteFile.exe
3304	WriteFile.exe
3304	WriteFile.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeSystemtimePrivilege	1088	4643a65fbe48cb8d17b33aea46ffb8d33ae1e7497dcfffe1715cb93010abd4bf.exe
Token: SeDebugPrivilege	3576	Client.exe
Token: SeDebugPrivilege	3304	WriteFile.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
1088	4643a65fbe48cb8d17b33aea46ffb8d33ae1e7497dcfffe1715cb93010abd4bf.exe
1088	4643a65fbe48cb8d17b33aea46ffb8d33ae1e7497dcfffe1715cb93010abd4bf.exe
3304	WriteFile.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1088 wrote to memory of 3576	1088	4643a65fbe48cb8d17b33aea46ffb8d33ae1e7497dcfffe1715cb93010abd4bf.exe	100
PID 1088 wrote to memory of 3576	1088	4643a65fbe48cb8d17b33aea46ffb8d33ae1e7497dcfffe1715cb93010abd4bf.exe	100
PID 3576 wrote to memory of 2968	3576	Client.exe	102
PID 3576 wrote to memory of 2968	3576	Client.exe	102
PID 3576 wrote to memory of 1700	3576	Client.exe	103
PID 3576 wrote to memory of 1700	3576	Client.exe	103
PID 1700 wrote to memory of 3628	1700	cmd.exe	107
PID 1700 wrote to memory of 3628	1700	cmd.exe	107
PID 2968 wrote to memory of 368	2968	cmd.exe	106
PID 2968 wrote to memory of 368	2968	cmd.exe	106
PID 1700 wrote to memory of 3304	1700	cmd.exe	108
PID 1700 wrote to memory of 3304	1700	cmd.exe	108

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\4643a65fbe48cb8d17b33aea46ffb8d33ae1e7497dcfffe1715cb93010abd4bf.exe
"C:\Users\Admin\AppData\Local\Temp\4643a65fbe48cb8d17b33aea46ffb8d33ae1e7497dcfffe1715cb93010abd4bf.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1088
- C:\Client.exe
  "C:\Client.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3576
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "WriteFile" /tr '"C:\Users\Admin\AppData\Roaming\WriteFile.exe"' & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2968
  - - C:\Windows\system32\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "WriteFile" /tr '"C:\Users\Admin\AppData\Roaming\WriteFile.exe"'
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:368
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp1D86.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1700
  - - C:\Windows\system32\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:3628
  - - C:\Users\Admin\AppData\Roaming\WriteFile.exe
      "C:\Users\Admin\AppData\Roaming\WriteFile.exe"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      PID:3304
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1088 -s 1856
  2⤵
  - Program crash
  PID:4644

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 1088 -ip 1088
1⤵
PID:1324

Network

MITRE ATT&CK Enterprise v15

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

2

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

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Downloads

C:\Client.exe

Filesize
74KB

MD5
b7d579e26b673c6866c448e6af708515

SHA1
ef19b6d6fcd369c8636dc0539dd32589a89f2c09

SHA256
6035245b15f24292d031bb460c6b9a4301ced628f93d37b58771aca3b49aa07a

SHA512
df0ad0004e9e40274bdd4ac586400b096679d456e35b0ac2a2d25c15cff17557428bb38023c8ed38c52e3d7eef962cfd1c3092f82fe5ea2ef1cf0ea442c8741c

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp1D86.tmp.bat

Filesize
153B

MD5
c9f8a087a7a74cac6db6a591e0fbd702

SHA1
2112e933593e220ef8e47623be6b730b91d67120

SHA256
ed90a1fea6fccbe403132d0f96d8e26918db5c8c6f2e6779ad405c0e5443ded8

SHA512
b488b3ec72344ce2926111d1e46a20816e79995109d298b7772c906dec9cd7d0cc49cbdd2ff3492678b3ad0c5642d9f8f016391b65f41369569240e0973e0e1c

Download Submit
C:\Users\Admin\AppData\Roaming\MyData\DataLogs.conf

Filesize
8B

MD5
cf759e4c5f14fe3eec41b87ed756cea8

SHA1
c27c796bb3c2fac929359563676f4ba1ffada1f5

SHA256
c9f9f193409217f73cc976ad078c6f8bf65d3aabcf5fad3e5a47536d47aa6761

SHA512
c7f832aee13a5eb36d145f35d4464374a9e12fa2017f3c2257442d67483b35a55eccae7f7729243350125b37033e075efbc2303839fd86b81b9b4dca3626953b

Download Submit
memory/1088-0-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/1088-2-0x0000000000950000-0x000000000095F000-memory.dmp

Filesize
60KB

Download
memory/1088-1-0x0000000068CD0000-0x0000000068CDF000-memory.dmp

Filesize
60KB

Download
memory/1088-29-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3576-14-0x00007FFDE7EA3000-0x00007FFDE7EA5000-memory.dmp

Filesize
8KB

Download
memory/3576-15-0x0000000000870000-0x0000000000888000-memory.dmp

Filesize
96KB

Download
memory/3576-17-0x00007FFDE7EA0000-0x00007FFDE8961000-memory.dmp

Filesize
10.8MB

Download
memory/3576-22-0x00007FFDE7EA0000-0x00007FFDE8961000-memory.dmp

Filesize
10.8MB

Download
memory/3576-23-0x00007FFDE7EA0000-0x00007FFDE8961000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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