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 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

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-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation	39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 2 IoCs

Processes:

Client.exeWriteFile.exe

pid process

2896 Client.exe
1560 WriteFile.exe

pid	process
2896	Client.exe
1560	WriteFile.exe

UPX packed file 26 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/1780-0-0x0000000068CD0000-0x0000000068CDF000-memory.dmp	upx
behavioral2/memory/1780-1-0x0000000000CB0000-0x0000000000CBF000-memory.dmp	upx
behavioral2/memory/1780-2-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-26-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-44-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-42-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-46-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-40-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-38-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-36-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-34-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-32-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-30-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-28-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-24-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-22-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-20-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-18-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-16-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-14-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-13-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-10-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-8-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-6-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-4-0x0000000010000000-0x000000001003C000-memory.dmp	upx
behavioral2/memory/1780-3-0x0000000010000000-0x000000001003C000-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

516 1780 WerFault.exe 39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exe

pid process

904 schtasks.exe
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

5052 timeout.exe

pid	pid_target	process	target process
516	1780	WerFault.exe	39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe

pid	process
904	schtasks.exe

pid	process
5052	timeout.exe

Suspicious behavior: EnumeratesProcesses 32 IoCs

Processes:

39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exeClient.exeWriteFile.exe

pid	process
1780	39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe
1780	39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
2896	Client.exe
1560	WriteFile.exe
1560	WriteFile.exe
1560	WriteFile.exe
1560	WriteFile.exe
1560	WriteFile.exe
1560	WriteFile.exe
1560	WriteFile.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client.exeWriteFile.exe

description pid process

Token: SeDebugPrivilege 2896 Client.exe
Token: SeDebugPrivilege 1560 WriteFile.exe

description	pid	process
Token: SeDebugPrivilege	2896	Client.exe
Token: SeDebugPrivilege	1560	WriteFile.exe

Suspicious use of SetWindowsHookEx 4 IoCs

Processes:

39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exeWriteFile.exe

pid	process
1780	39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe
1780	39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe
1780	39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe
1560	WriteFile.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exeClient.execmd.execmd.exe

description	pid	process	target process
PID 1780 wrote to memory of 2896	1780	39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe	Client.exe
PID 1780 wrote to memory of 2896	1780	39a150550c203ceed145c316398651e550941e0364510b5a1534bed963eaa739.exe	Client.exe
PID 2896 wrote to memory of 4064	2896	Client.exe	cmd.exe
PID 2896 wrote to memory of 4064	2896	Client.exe	cmd.exe
PID 2896 wrote to memory of 4368	2896	Client.exe	cmd.exe
PID 2896 wrote to memory of 4368	2896	Client.exe	cmd.exe
PID 4064 wrote to memory of 904	4064	cmd.exe	schtasks.exe
PID 4064 wrote to memory of 904	4064	cmd.exe	schtasks.exe
PID 4368 wrote to memory of 5052	4368	cmd.exe	timeout.exe
PID 4368 wrote to memory of 5052	4368	cmd.exe	timeout.exe
PID 4368 wrote to memory of 1560	4368	cmd.exe	WriteFile.exe
PID 4368 wrote to memory of 1560	4368	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
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1780
- 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:2896
- - 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:4064
  - - C:\Windows\system32\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "WriteFile" /tr '"C:\Users\Admin\AppData\Roaming\WriteFile.exe"'
      4⤵
      Creates scheduled task(s)
      PID:904
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpB556.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4368
  - - C:\Windows\system32\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:5052
  - - 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:1560
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1780 -s 1852
  2⤵
  - Program crash
  PID:516

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 1780 -ip 1780
1⤵
PID:1012

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

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\tmpB556.tmp.bat

Filesize
153B

MD5
1f282cd4dee8c8039725403a9ad251b7

SHA1
ce6292990f17abd7e278374c3e3b1600dfe14372

SHA256
e5209d78d4ba9d7d85460442a975948107d54d8b271f5307d65be19c3b225f13

SHA512
5afc7d899c26e43e4032203d608271b8ad400752241cb5c88688b4da410df47e4bcbaf67595f0a436da645a732e0803986fd1f1cadf95d6cfcc58836caf53ee4

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

Filesize
8B

MD5
cf759e4c5f14fe3eec41b87ed756cea8

SHA1
c27c796bb3c2fac929359563676f4ba1ffada1f5

SHA256
c9f9f193409217f73cc976ad078c6f8bf65d3aabcf5fad3e5a47536d47aa6761

SHA512
c7f832aee13a5eb36d145f35d4464374a9e12fa2017f3c2257442d67483b35a55eccae7f7729243350125b37033e075efbc2303839fd86b81b9b4dca3626953b

Download Submit
memory/1780-10-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-42-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-22-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-26-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-24-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-2-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-46-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-40-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-38-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-36-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-34-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-32-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-30-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-28-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-1-0x0000000000CB0000-0x0000000000CBF000-memory.dmp

Filesize
60KB

Download
memory/1780-44-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-20-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-18-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-16-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-14-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-13-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-0-0x0000000068CD0000-0x0000000068CDF000-memory.dmp

Filesize
60KB

Download
memory/1780-8-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-6-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-4-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/1780-3-0x0000000010000000-0x000000001003C000-memory.dmp

Filesize
240KB

Download
memory/2896-60-0x00007FFE96180000-0x00007FFE96C41000-memory.dmp

Filesize
10.8MB

Download
memory/2896-65-0x00007FFE96180000-0x00007FFE96C41000-memory.dmp

Filesize
10.8MB

Download
memory/2896-58-0x00007FFE96183000-0x00007FFE96185000-memory.dmp

Filesize
8KB

Download
memory/2896-57-0x0000000000D40000-0x0000000000D58000-memory.dmp

Filesize
96KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads