asyncrat | 39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739

General

Target

39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe
Size

1.9MB
MD5

4be3faf962aeccdded46157b294bf623
SHA1

77a83c8abc77e5d093412d6bbc21dff52d94e3ca
SHA256

39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739
SHA512

91ea0cb2cfb2a28429cce867626098895f12dd60f41c9b88d7b69cb24a2bc7e1899d45654aee29fa4344a584ffeb23cc02118d4b97f52beafc80b7cb2a6516ff
SSDEEP

24576:23eHKTm2k57CY4r3XQ8hxMqhKcMxcqqaxA05THmAQpwjzXdsjfb1WS8bPzIV8nwe:2c5GY4r3TVKcMqa1tGvUsVWS8bPW8wkX

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 2 IoCs

Detects VenomRAT.

rat

Processes:

resource	yara_rule
C:\Client.exe	VenomRAT
behavioral2/memory/3712-65-0x0000000000F60000-0x0000000000F78000-memory.dmp	VenomRAT

Async RAT payload 1 IoCs

rat

Processes:

resource	yara_rule
C:\Client.exe	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

Processes:

39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exeClient.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000\Control Panel\International\Geo\Nation	39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.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

Processes:

Client.exeWriteFile.exe

pid process

3712 Client.exe
4960 WriteFile.exe

pid	process
3712	Client.exe
4960	WriteFile.exe

UPX packed file 29 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/2200-0-0x0000000068CD0000-0x0000000068CDF000-memory.dmp	upx
behavioral2/memory/2200-3-0x0000000000C40000-0x0000000000C4F000-memory.dmp	upx
behavioral2/memory/2200-1-0x0000000068CD0000-0x0000000068CDF000-memory.dmp	upx
behavioral2/memory/2200-4-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-35-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-37-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-52-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-51-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-50-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-48-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-46-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-44-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-41-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-33-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-31-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-29-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-28-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-25-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-23-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-21-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-19-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-17-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-15-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-13-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-11-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-7-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-6-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-5-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/2200-9-0x0000000010000000-0x000000001003C000-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

Processes:

WerFault.exe

pid pid_target process target process

4132 2200 WerFault.exe 39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe

pid	pid_target	process	target process
4132	2200	WerFault.exe	39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe

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

Processes:

39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe

Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

4200 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

Processes:

schtasks.exe

pid process

4216 schtasks.exe

pid	process
4200	timeout.exe

pid	process
4216	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

Processes:

39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exeClient.exeWriteFile.exe

pid	process
2200	39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe
2200	39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe
3712	Client.exe
3712	Client.exe
3712	Client.exe
3712	Client.exe
3712	Client.exe
3712	Client.exe
3712	Client.exe
3712	Client.exe
3712	Client.exe
3712	Client.exe
3712	Client.exe
3712	Client.exe
3712	Client.exe
3712	Client.exe
3712	Client.exe
3712	Client.exe
3712	Client.exe
3712	Client.exe
3712	Client.exe
4960	WriteFile.exe
4960	WriteFile.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client.exeWriteFile.exe

description pid process

Token: SeDebugPrivilege 3712 Client.exe
Token: SeDebugPrivilege 4960 WriteFile.exe

description	pid	process
Token: SeDebugPrivilege	3712	Client.exe
Token: SeDebugPrivilege	4960	WriteFile.exe

Suspicious use of SetWindowsHookEx 4 IoCs

Processes:

39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exeWriteFile.exe

pid	process
2200	39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe
2200	39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe
2200	39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe
4960	WriteFile.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exeClient.execmd.execmd.exe

description	pid	process	target process
PID 2200 wrote to memory of 3712	2200	39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe	Client.exe
PID 2200 wrote to memory of 3712	2200	39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe	Client.exe
PID 3712 wrote to memory of 4104	3712	Client.exe	cmd.exe
PID 3712 wrote to memory of 4104	3712	Client.exe	cmd.exe
PID 3712 wrote to memory of 4472	3712	Client.exe	cmd.exe
PID 3712 wrote to memory of 4472	3712	Client.exe	cmd.exe
PID 4472 wrote to memory of 4200	4472	cmd.exe	timeout.exe
PID 4472 wrote to memory of 4200	4472	cmd.exe	timeout.exe
PID 4104 wrote to memory of 4216	4104	cmd.exe	schtasks.exe
PID 4104 wrote to memory of 4216	4104	cmd.exe	schtasks.exe
PID 4472 wrote to memory of 4960	4472	cmd.exe	WriteFile.exe
PID 4472 wrote to memory of 4960	4472	cmd.exe	WriteFile.exe

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\39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe
"C:\Users\Admin\AppData\Local\Temp\39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2200
- 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:3712
- - 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:4104
  - - 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:4216
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp7A18.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4472
  - - C:\Windows\system32\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:4200
  - - 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:4960
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2200 -s 1840
  2⤵
  - Program crash
  PID:4132

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 2200 -ip 2200
1⤵
PID:732

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\tmp7A18.tmp.bat

Filesize
153B

MD5
3e5f16dce5e54e5c393559036eaa4c95

SHA1
fdb6a0ea7c0758a2cfe20c08bac77d57c994cfc0

SHA256
d3b835e50a408a10e2c7e663437eec75d5cbaae52969ac74f51ede9ca94a609e

SHA512
27b10971eb49fbb61de4401d0ca5302740d2d26ddfec65156de387e46fb81b402b991de655b878d7e26f34f3b2c20cf371e6e1010e1b33079111f88f85d7f93b

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

Filesize
8B

MD5
cf759e4c5f14fe3eec41b87ed756cea8

SHA1
c27c796bb3c2fac929359563676f4ba1ffada1f5

SHA256
c9f9f193409217f73cc976ad078c6f8bf65d3aabcf5fad3e5a47536d47aa6761

SHA512
c7f832aee13a5eb36d145f35d4464374a9e12fa2017f3c2257442d67483b35a55eccae7f7729243350125b37033e075efbc2303839fd86b81b9b4dca3626953b

Download Submit
memory/2200-13-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-50-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-37-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-52-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-28-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-4-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-3-0x0000000000C40000-0x0000000000C4F000-memory.dmp

Filesize
60KB

Download
memory/2200-1-0x0000000068CD0000-0x0000000068CDF000-memory.dmp

Filesize
60KB

Download
memory/2200-48-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-25-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-44-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-41-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-9-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-33-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-31-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-29-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-51-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-35-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-46-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-23-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-21-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-19-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-17-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-15-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-0-0x0000000068CD0000-0x0000000068CDF000-memory.dmp

Filesize
60KB

Download
memory/2200-11-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-7-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-6-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2200-5-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/3712-65-0x0000000000F60000-0x0000000000F78000-memory.dmp

Filesize
96KB

Download
memory/3712-72-0x00007FF81E910000-0x00007FF81F3D1000-memory.dmp

Filesize
10.8MB

Download
memory/3712-73-0x00007FF81E910000-0x00007FF81F3D1000-memory.dmp

Filesize
10.8MB

Download
memory/3712-67-0x00007FF81E910000-0x00007FF81F3D1000-memory.dmp

Filesize
10.8MB

Download
memory/3712-64-0x00007FF81E913000-0x00007FF81E915000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads