asyncrat | f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af

General

Target
f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
Size 45KB
Sample260816-vrvmrssfpb
SHA256 f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af
MD5 0804450541b2d13b610c8b678dcefebe
SHA1 2551474646145dc5a53a615f4456457c933e36cd
SHA512 80646117960bc6eb9f341ddbf548e36ccc1ffe615dae56650cbd0681b7a3476c70e138959679618e29011c01d41dc9e690629caf6fe43604cfee6bfc3a96416e
SSDEEP 768:ku40ZTX3uXTaWUgzW0mo2qwtNd3u40cMOPI04zjb5gX6i5jbE1Tj1pBDZMx:ku40ZTXEb278+M3043bWXDJiTR3dMx
TLSH
T126232A003BE8812BF2BE4F78A9F26145867AF1736603D54E1CC452DB5613FC69A426FE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default command_and_control defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

e.streamforester.name:80
e.streamforester.name:22
e.streamforester.name:8080
e.streamforester.name:8880
e.streamforester.name:2052
e.streamforester.name:2082
e.streamforester.name:2086
e.streamforester.name:2095
e.streamforester.name:443
e.streamforester.name:2053
e.streamforester.name:2083
e.streamforester.name:2087
e.streamforester.name:2096
e.streamforester.name:8443
www.e.streamforester.name:80
www.e.streamforester.name:22
www.e.streamforester.name:8080
www.e.streamforester.name:8880
www.e.streamforester.name:2052
www.e.streamforester.name:2082
www.e.streamforester.name:2086
www.e.streamforester.name:2095
www.e.streamforester.name:443
www.e.streamforester.name:2053
www.e.streamforester.name:2083
www.e.streamforester.name:2087
www.e.streamforester.name:2096
www.e.streamforester.name:8443
azorult.e.streamforester.name:80
azorult.e.streamforester.name:22
azorult.e.streamforester.name:8080
azorult.e.streamforester.name:8880
azorult.e.streamforester.name:2052
azorult.e.streamforester.name:2082
azorult.e.streamforester.name:2086
azorult.e.streamforester.name:2095
azorult.e.streamforester.name:443
azorult.e.streamforester.name:2053
azorult.e.streamforester.name:2083
azorult.e.streamforester.name:2087
azorult.e.streamforester.name:2096
azorult.e.streamforester.name:8443
cryptolocker.e.streamforester.name:80
cryptolocker.e.streamforester.name:22
cryptolocker.e.streamforester.name:8080
cryptolocker.e.streamforester.name:8880
cryptolocker.e.streamforester.name:2052
cryptolocker.e.streamforester.name:2082
cryptolocker.e.streamforester.name:2086
cryptolocker.e.streamforester.name:2095
cryptolocker.e.streamforester.name:443
cryptolocker.e.streamforester.name:2053
cryptolocker.e.streamforester.name:2083
cryptolocker.e.streamforester.name:2087
cryptolocker.e.streamforester.name:2096
cryptolocker.e.streamforester.name:8443

Mutex

f7E5usiayklr

Attributes

delay
0
install
true
install_file
fkn2r.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/0x0009000000024540-8.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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe

Executes dropped EXE 2 IoCs

pid	Process
864	fkn2r.exe
1740	fkn2r.exe

Outbound SSH connection to public host 2 TTPs 4 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	25	172.67.70.147:22	864	fkn2r.exe
SSH destination	48	104.26.5.5:22	864	fkn2r.exe
SSH destination	53	104.26.4.5:22	864	fkn2r.exe
SSH destination	95	104.26.5.5:22	864	fkn2r.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
2540	cmd.exe
4308	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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	fkn2r.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	fkn2r.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.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	timeout.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
2976	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
4960	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
Token: SeDebugPrivilege	864	fkn2r.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 2792 wrote to memory of 2540	2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe	85
PID 2792 wrote to memory of 4308	2792	f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe	87
PID 4308 wrote to memory of 2976	4308	cmd.exe	89
PID 2540 wrote to memory of 4960	2540	cmd.exe	90
PID 4308 wrote to memory of 1740	4308	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe
"C:\Users\Admin\AppData\Local\Temp\f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2792
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "fkn2r" /tr '"C:\Users\Admin\AppData\Roaming\fkn2r.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2540
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "fkn2r" /tr '"C:\Users\Admin\AppData\Roaming\fkn2r.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4960
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp8CDA.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4308
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2976
- - C:\Users\Admin\AppData\Roaming\fkn2r.exe
    "C:\Users\Admin\AppData\Roaming\fkn2r.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1740

C:\Users\Admin\AppData\Roaming\fkn2r.exe
"C:\Users\Admin\AppData\Roaming\fkn2r.exe"
1⤵
- Executes dropped EXE
- Outbound SSH connection to public host
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:864

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

tmp8CDA.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp8CDA.tmp.bat
Size 149B
SHA256 da7d8cb6d127bb3df3c5e475cba8b20a5426f00dc461ee803ebabea81df8eb3c
MD5 afd83289f6ea43af638441ce83c31202
SHA1 86056f168a216ce1193d15db48346f3ffa0ae64f
SHA512 4861656dc96236f1a735e96a1a787f39ab61af94070d79ab22a5a97ae3df1db0c71d756076a60012dcee955d96093ff7a39ffe3f8e707d754ed2d3e8198f1cf5
TLSH
T148C02B5365C6EA1E3906682313FAD4CCA2726C393F44BB00C704444D2280848F4D9741
MD5 SHA1 SHA512 TLSH

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fkn2r.exe

Path C:\Users\Admin\AppData\Roaming\fkn2r.exe
Size 45KB
SHA256 f4f2cb776803707eed93cb9df8186af02ae51734803e8e6b2f7a2e6a4559f3af
MD5 0804450541b2d13b610c8b678dcefebe
SHA1 2551474646145dc5a53a615f4456457c933e36cd
SHA512 80646117960bc6eb9f341ddbf548e36ccc1ffe615dae56650cbd0681b7a3476c70e138959679618e29011c01d41dc9e690629caf6fe43604cfee6bfc3a96416e
SSDEEP 768:ku40ZTX3uXTaWUgzW0mo2qwtNd3u40cMOPI04zjb5gX6i5jbE1Tj1pBDZMx:ku40ZTXEb278+M3043bWXDJiTR3dMx
TLSH
T126232A003BE8812BF2BE4F78A9F26145867AF1736603D54E1CC452DB5613FC69A426FE
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/864-10-0x0000000004B30000-0x0000000004B40000-memory.dmp

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memory/864-13-0x0000000004B30000-0x0000000004B40000-memory.dmp

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memory/2792-0-0x0000000000C80000-0x0000000000C92000-memory.dmp

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memory/2792-1-0x0000000005720000-0x0000000005730000-memory.dmp

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memory/2792-2-0x0000000005680000-0x000000000571C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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