agenttesla | 7c204f35b9ee817d98670d20ad2a8d41e6d7a0cf96d86c5bc44cdf41d9296b95

General

Target

$PLUGINSDIR/unrngcgu.dll
Size

24KB
MD5

8bb161b0a10d00995ed1a96179bfd7f1
SHA1

eb487924c9478448dddfce6379043a8bd86ba6ac
SHA256

e3ad6c7973071ba2d0a080b334434d2bf2a93215b18d34b914809019672d66ae
SHA512

e6c0b456d58f45a44dc51f4c9951fccaf3acd174419b614fd6fd04a13cbfd8cf833c166e65880091e681976a3fe9f64b5f16d8b36746754c302ce5cbf49da2c4
SSDEEP

768:et+65SU5rPoCzwqir8qXNspVQmUgnPyg:yBEU5ToC8qirjsMmPPyg

Score

10^/10

agenttesla collection credential_access discovery keylogger spyware stealer trojan

Malware Config

Extracted

Family

agenttesla

C2

https://api.telegram.org/bot1803146213:AAHYyCRx7FggQ9LfPbrIs79ZUWCEc9wNnDo/sendDocument

Signatures

AgentTesla
Agent Tesla is a remote access tool (RAT) written in visual basic.
keylogger trojan stealer spyware agenttesla

AgentTesla payload 4 IoCs

resource	yara_rule
behavioral3/memory/1912-1-0x0000000000400000-0x000000000044C000-memory.dmp	family_agenttesla
behavioral3/memory/1912-4-0x0000000000400000-0x000000000044C000-memory.dmp	family_agenttesla
behavioral3/memory/1912-6-0x0000000000400000-0x000000000044C000-memory.dmp	family_agenttesla
behavioral3/memory/1912-8-0x00000000003B0000-0x00000000003EC000-memory.dmp	family_agenttesla

Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003
Reads WinSCP keys stored on the system 2 TTPs
Tries to access WinSCP stored sessions.
spyware stealer

Data from Local System
T1005

Credentials in Registry
T1552.002
Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Unsecured Credentials: Credentials In Files 1 TTPs
Steal credentials from unsecured files.
credential_access stealer

Credentials In Files
T1552.001

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4177215427-74451935-3209572229-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	rundll32.exe
Key opened	\REGISTRY\USER\S-1-5-21-4177215427-74451935-3209572229-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	rundll32.exe
Key opened	\REGISTRY\USER\S-1-5-21-4177215427-74451935-3209572229-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	rundll32.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2488 set thread context of 1912	2488	rundll32.exe	31

System Location Discovery: System Language Discovery 1 TTPs 2 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	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1912	rundll32.exe
1912	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1912	rundll32.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 3044 wrote to memory of 2488	3044	rundll32.exe	30
PID 3044 wrote to memory of 2488	3044	rundll32.exe	30
PID 3044 wrote to memory of 2488	3044	rundll32.exe	30
PID 3044 wrote to memory of 2488	3044	rundll32.exe	30
PID 3044 wrote to memory of 2488	3044	rundll32.exe	30
PID 3044 wrote to memory of 2488	3044	rundll32.exe	30
PID 3044 wrote to memory of 2488	3044	rundll32.exe	30
PID 2488 wrote to memory of 1912	2488	rundll32.exe	31
PID 2488 wrote to memory of 1912	2488	rundll32.exe	31
PID 2488 wrote to memory of 1912	2488	rundll32.exe	31
PID 2488 wrote to memory of 1912	2488	rundll32.exe	31
PID 2488 wrote to memory of 1912	2488	rundll32.exe	31
PID 2488 wrote to memory of 1912	2488	rundll32.exe	31
PID 2488 wrote to memory of 1912	2488	rundll32.exe	31
PID 2488 wrote to memory of 1912	2488	rundll32.exe	31
PID 2488 wrote to memory of 1912	2488	rundll32.exe	31
PID 2488 wrote to memory of 1912	2488	rundll32.exe	31
PID 2488 wrote to memory of 1912	2488	rundll32.exe	31
PID 2488 wrote to memory of 1912	2488	rundll32.exe	31
PID 2488 wrote to memory of 1912	2488	rundll32.exe	31
PID 2488 wrote to memory of 1912	2488	rundll32.exe	31

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4177215427-74451935-3209572229-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	rundll32.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4177215427-74451935-3209572229-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	rundll32.exe

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\unrngcgu.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:3044
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\unrngcgu.dll,#1
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2488
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\unrngcgu.dll,#1
    3⤵
    - Accesses Microsoft Outlook profiles
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - outlook_office_path
    - outlook_win_path
    PID:1912

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

5

T1552

Credentials In Files

4

T1552.001

Credentials in Registry

1

T1552.002

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1912-8-0x00000000003B0000-0x00000000003EC000-memory.dmp

Filesize
240KB

Download
memory/1912-10-0x00000000743A0000-0x0000000074A8E000-memory.dmp

Filesize
6.9MB

Download
memory/1912-16-0x00000000743A0000-0x0000000074A8E000-memory.dmp

Filesize
6.9MB

Download
memory/1912-4-0x0000000000400000-0x000000000044C000-memory.dmp

Filesize
304KB

Download
memory/1912-6-0x0000000000400000-0x000000000044C000-memory.dmp

Filesize
304KB

Download
memory/1912-7-0x00000000743AE000-0x00000000743AF000-memory.dmp

Filesize
4KB

Download
memory/1912-1-0x0000000000400000-0x000000000044C000-memory.dmp

Filesize
304KB

Download
memory/1912-9-0x00000000743A0000-0x0000000074A8E000-memory.dmp

Filesize
6.9MB

Download
memory/1912-15-0x00000000743A0000-0x0000000074A8E000-memory.dmp

Filesize
6.9MB

Download
memory/1912-12-0x00000000743A0000-0x0000000074A8E000-memory.dmp

Filesize
6.9MB

Download
memory/1912-11-0x00000000743A0000-0x0000000074A8E000-memory.dmp

Filesize
6.9MB

Download
memory/1912-13-0x00000000743AE000-0x00000000743AF000-memory.dmp

Filesize
4KB

Download
memory/1912-14-0x00000000743A0000-0x0000000074A8E000-memory.dmp

Filesize
6.9MB

Download
memory/2488-0-0x0000000010000000-0x000000001000A000-memory.dmp

Filesize
40KB

Download
memory/2488-2-0x0000000010000000-0x000000001000A000-memory.dmp

Filesize
40KB

Download

Analysis

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