agenttesla | 4b53a882fc87d037002401e58db022d2d9436c4e591b9f8b6817286267074295

General

Target

RFQ.exe
Size

414KB
MD5

8cf823ee0766126638d33918383ca5d8
SHA1

3b215b084b9ff049a860fc29108f62c4b6d2133b
SHA256

6de7efc9e04cb4db0acc603a7ed700b186d0545acd0e8e84a1d8cce668202dc8
SHA512

41cd0278ebb15faddd178fb826e8dc74021980f09b94ff785b1b6d88d5504c2e7b37450484666fd7a00e3c3e865459ace696c41ad84e4d0630d1ef893e93ed94

Score

10^/10

agenttesla collection coreentity evasion keylogger rezer0 spyware stealer trojan

Malware Config

Extracted

Family

agenttesla

Credentials

Protocol: smtp
Host:
mail.cpworldindia.com
Port:
587
Username:
import.cs@ahd.cpworldindia.com
Password:
imprtcs@2019

Signatures

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

CoreEntity .NET Packer 1 IoCs

A .NET packer called CoreEntity where it has embedded the payload as a BitMap object which is later decrypted.

coreentity

Processes:

resource	yara_rule
behavioral1/memory/1912-56-0x0000000000440000-0x0000000000448000-memory.dmp	coreentity

AgentTesla payload 6 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1788-65-0x0000000000400000-0x0000000000452000-memory.dmp	family_agenttesla
behavioral1/memory/1788-66-0x000000000044C91E-mapping.dmp	family_agenttesla
behavioral1/memory/1788-70-0x0000000000400000-0x0000000000452000-memory.dmp	family_agenttesla
behavioral1/memory/1788-68-0x0000000000400000-0x0000000000452000-memory.dmp	family_agenttesla
behavioral1/memory/1788-64-0x0000000000400000-0x0000000000452000-memory.dmp	family_agenttesla
behavioral1/memory/1788-63-0x0000000000400000-0x0000000000452000-memory.dmp	family_agenttesla

ReZer0 packer 1 IoCs

Detects ReZer0, a packer with multiple versions used in various campaigns.

rezer0

Processes:

resource	yara_rule
behavioral1/memory/1912-57-0x00000000020C0000-0x0000000002118000-memory.dmp	rezer0

Disables Task Manager via registry modification
evasion
Drops file in Drivers directory 1 IoCs

Processes:

RFQ.exe

description ioc process

File opened for modification C:\Windows\system32\drivers\etc\hosts RFQ.exe
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
T1081
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
T1081
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
T1081

description	ioc	process
File opened for modification	C:\Windows\system32\drivers\etc\hosts	RFQ.exe

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

Processes:

RFQ.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RFQ.exe
Key opened	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RFQ.exe
Key opened	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RFQ.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

RFQ.exe

description pid process target process

PID 1912 set thread context of 1788 1912 RFQ.exe RFQ.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
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
T1053

Processes:

schtasks.exe

pid process

2012 schtasks.exe
Modifies registry key 1 TTPs 1 IoCs

Modify Registry
T1112

Processes:

REG.exe

pid process

436 REG.exe
Suspicious behavior: EnumeratesProcesses 3 IoCs

Processes:

RFQ.exeRFQ.exe

pid process

1912 RFQ.exe
1788 RFQ.exe
1788 RFQ.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

RFQ.exeRFQ.exe

description pid process

Token: SeDebugPrivilege 1912 RFQ.exe
Token: SeDebugPrivilege 1788 RFQ.exe

description	pid	process	target process
PID 1912 set thread context of 1788	1912	RFQ.exe	RFQ.exe

pid	process
2012	schtasks.exe

pid	process
436	REG.exe

pid	process
1912	RFQ.exe
1788	RFQ.exe
1788	RFQ.exe

description	pid	process
Token: SeDebugPrivilege	1912	RFQ.exe
Token: SeDebugPrivilege	1788	RFQ.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

RFQ.exeRFQ.exe

description	pid	process	target process
PID 1912 wrote to memory of 2012	1912	RFQ.exe	schtasks.exe
PID 1912 wrote to memory of 2012	1912	RFQ.exe	schtasks.exe
PID 1912 wrote to memory of 2012	1912	RFQ.exe	schtasks.exe
PID 1912 wrote to memory of 2012	1912	RFQ.exe	schtasks.exe
PID 1912 wrote to memory of 1788	1912	RFQ.exe	RFQ.exe
PID 1912 wrote to memory of 1788	1912	RFQ.exe	RFQ.exe
PID 1912 wrote to memory of 1788	1912	RFQ.exe	RFQ.exe
PID 1912 wrote to memory of 1788	1912	RFQ.exe	RFQ.exe
PID 1912 wrote to memory of 1788	1912	RFQ.exe	RFQ.exe
PID 1912 wrote to memory of 1788	1912	RFQ.exe	RFQ.exe
PID 1912 wrote to memory of 1788	1912	RFQ.exe	RFQ.exe
PID 1912 wrote to memory of 1788	1912	RFQ.exe	RFQ.exe
PID 1912 wrote to memory of 1788	1912	RFQ.exe	RFQ.exe
PID 1788 wrote to memory of 436	1788	RFQ.exe	REG.exe
PID 1788 wrote to memory of 436	1788	RFQ.exe	REG.exe
PID 1788 wrote to memory of 436	1788	RFQ.exe	REG.exe
PID 1788 wrote to memory of 436	1788	RFQ.exe	REG.exe
PID 1788 wrote to memory of 1916	1788	RFQ.exe	netsh.exe
PID 1788 wrote to memory of 1916	1788	RFQ.exe	netsh.exe
PID 1788 wrote to memory of 1916	1788	RFQ.exe	netsh.exe
PID 1788 wrote to memory of 1916	1788	RFQ.exe	netsh.exe

outlook_office_path 1 IoCs

Processes:

RFQ.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RFQ.exe

outlook_win_path 1 IoCs

Processes:

RFQ.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RFQ.exe

C:\Users\Admin\AppData\Local\Temp\RFQ.exe
"C:\Users\Admin\AppData\Local\Temp\RFQ.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1912

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\FzcrWS" /XML "C:\Users\Admin\AppData\Local\Temp\tmp3DFB.tmp"
2⤵
- Creates scheduled task(s)
PID:2012

C:\Users\Admin\AppData\Local\Temp\RFQ.exe
"{path}"
2⤵
- Drops file in Drivers directory
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- outlook_office_path
- outlook_win_path
PID:1788

C:\Windows\SysWOW64\REG.exe
REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
3⤵
- Modifies registry key
PID:436

C:\Windows\SysWOW64\netsh.exe
"netsh" wlan show profile
3⤵
PID:1916

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Modify Registry

1

T1112

Credential Access

Credentials in Files

3

T1081

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

3

T1005

Email Collection

1

T1114

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp3DFB.tmp
Filesize
1KB

MD5
a59658aa8b58b795528d407e8ce537bf

SHA1
c819cd4378d6470fb3f4d3f5ab4ef41789d7ee6e

SHA256
c6f5de0bc1572ef017aba3f87f617ec75e783cee9575559dc821e628ef7b1acd

SHA512
e84ca1a5381c240122a325240b59e3e477ebb12f81f153f9f0b2cf2cf02a8ea00006a15372dcb360ad613affda4d27b303baac58cace6d31fc5514390969bae8

Download Submit
memory/436-72-0x0000000000000000-mapping.dmp

Download
memory/1788-61-0x0000000000400000-0x0000000000452000-memory.dmp

Filesize
328KB

Download
memory/1788-68-0x0000000000400000-0x0000000000452000-memory.dmp

Filesize
328KB

Download
memory/1788-60-0x0000000000400000-0x0000000000452000-memory.dmp

Filesize
328KB

Download
memory/1788-63-0x0000000000400000-0x0000000000452000-memory.dmp

Filesize
328KB

Download
memory/1788-65-0x0000000000400000-0x0000000000452000-memory.dmp

Filesize
328KB

Download
memory/1788-66-0x000000000044C91E-mapping.dmp

Download
memory/1788-70-0x0000000000400000-0x0000000000452000-memory.dmp

Filesize
328KB

Download
memory/1788-64-0x0000000000400000-0x0000000000452000-memory.dmp

Filesize
328KB

Download
memory/1912-57-0x00000000020C0000-0x0000000002118000-memory.dmp

Filesize
352KB

Download
memory/1912-56-0x0000000000440000-0x0000000000448000-memory.dmp

Filesize
32KB

Download
memory/1912-54-0x0000000000890000-0x00000000008FE000-memory.dmp

Filesize
440KB

Download
memory/1912-55-0x0000000075F61000-0x0000000075F63000-memory.dmp

Filesize
8KB

Download
memory/1916-73-0x0000000000000000-mapping.dmp

Download
memory/2012-58-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads