asyncrat | e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf

General

Target
e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
Size 45KB
Sample260601-stan9saw3j
SHA256 e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf
MD5 2d4b666e6f83581f4b5a8ffc3f40ed10
SHA1 e0be81eae3fc1f12abbaef994f3f565ea6294af6
SHA512 e49d3ee81b584e7cb26e99e14b8b9a4ad06e08fb0b91e316f7d23716629669c3953a47151481a762c2de4ab04dfb755dcc3a344171f8a780fa3f7dc6de2a5a09
SSDEEP 768:cu7//5THrq+CWUoDuMmo2qFg3Xo5EayPIKzjb7gX3iOv+9zknWWP7HuBDZUx:cu7n5TH2A2LQEabK3bEXSOK0P7AdUx
TLSH
T156232B003BE8812BF2BE4F7899F26145867AF5636603D54A1CC441DB5B13FC69A42AFE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

linksexviet.com:443
linksexviet.com:80
linksexviet.com:7797
linksexviet.com:8707
linksexviet.com:6620
www.linksexviet.com:443
www.linksexviet.com:80
www.linksexviet.com:7797
www.linksexviet.com:8707
www.linksexviet.com:6620
formbook.linksexviet.com:443
formbook.linksexviet.com:80
formbook.linksexviet.com:7797
formbook.linksexviet.com:8707
formbook.linksexviet.com:6620
client.linksexviet.com:443
client.linksexviet.com:80
client.linksexviet.com:7797
client.linksexviet.com:8707
client.linksexviet.com:6620
cryptolocker.linksexviet.com:443
cryptolocker.linksexviet.com:80
cryptolocker.linksexviet.com:7797
cryptolocker.linksexviet.com:8707
cryptolocker.linksexviet.com:6620
malware.linksexviet.com:443
malware.linksexviet.com:80
malware.linksexviet.com:7797
malware.linksexviet.com:8707
malware.linksexviet.com:6620

Mutex

OU0kddVr8u2L

Attributes

delay
0
install
true
install_file
2sms0.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
behavioral2/files/0x001f00000002b3a0-8.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
4132	2sms0.exe
4736	2sms0.exe

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

System Information Discovery
T1082

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	2sms0.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2sms0.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
3976	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
3848	schtasks.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
Token: SeDebugPrivilege	4132	2sms0.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3520 wrote to memory of 800	3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe	80
PID 3520 wrote to memory of 4444	3520	e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe	82
PID 4444 wrote to memory of 3976	4444	cmd.exe	84
PID 800 wrote to memory of 3848	800	cmd.exe	85
PID 4444 wrote to memory of 4736	4444	cmd.exe	88

C:\Users\Admin\AppData\Local\Temp\e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe
"C:\Users\Admin\AppData\Local\Temp\e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3520
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "2sms0" /tr '"C:\Users\Admin\AppData\Roaming\2sms0.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:800
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "2sms0" /tr '"C:\Users\Admin\AppData\Roaming\2sms0.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3848
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp4050.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4444
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3976
- - C:\Users\Admin\AppData\Roaming\2sms0.exe
    "C:\Users\Admin\AppData\Roaming\2sms0.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4736

C:\Users\Admin\AppData\Roaming\2sms0.exe
"C:\Users\Admin\AppData\Roaming\2sms0.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:4132

Network

MITRE ATT&CK Enterprise v16

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

System Information Discovery

1

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

tmp4050.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp4050.tmp.bat
Size 149B
SHA256 cfa1e68f68321f9395c472f34a6b59177863cd9bee71601958340360d21ba191
MD5 b8957b8ebbef33c9ef7b7897f143323f
SHA1 9a8a7fd0e4a47a3eac7cb1c4fa676da8de824231
SHA512 052d4ad25c2a20eef62d3d81d53b07f13eb681cfeac24c830e6fc41c07d8045cbd9960ea0b2a3a37778611e89eb7ffb0dc698cf97aa8bd065925883e4b2349ca
TLSH
T159C02B529DC5EE0F7809642302FBD8CD91767C193F80BF40C344804D928048CF4E9345
MD5 SHA1 SHA512 TLSH

Submit Download

2sms0.exe

Path C:\Users\Admin\AppData\Roaming\2sms0.exe
Size 45KB
SHA256 e7a81e71bce8100f1caee1cc16c16a00258552d3fa4dba4d56e6b3c76cf416bf
MD5 2d4b666e6f83581f4b5a8ffc3f40ed10
SHA1 e0be81eae3fc1f12abbaef994f3f565ea6294af6
SHA512 e49d3ee81b584e7cb26e99e14b8b9a4ad06e08fb0b91e316f7d23716629669c3953a47151481a762c2de4ab04dfb755dcc3a344171f8a780fa3f7dc6de2a5a09
SSDEEP 768:cu7//5THrq+CWUoDuMmo2qFg3Xo5EayPIKzjb7gX3iOv+9zknWWP7HuBDZUx:cu7n5TH2A2LQEabK3bEXSOK0P7AdUx
TLSH
T156232B003BE8812BF2BE4F7899F26145867AF5636603D54A1CC441DB5B13FC69A42AFE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3520-0-0x0000000000B60000-0x0000000000B72000-memory.dmp

Download

memory/3520-1-0x0000000005720000-0x0000000005730000-memory.dmp

Download

memory/3520-2-0x0000000005630000-0x00000000056CC000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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