MBCProject-mbc-markdown/collection/screen-capture.md

ID	E1113
Objective(s)	Collection, Credential Access
Related ATT&CK Techniques	Screen Capture (T1113)
Version	2.3
Created	1 August 2019
Last Modified	27 April 2024

Screen Capture

Malware takes screen captures of the desktop. This technique is often used by cyber attackers to gather sensitive information, such as login credentials, personal data, or confidential documents. The malware can use various methods to capture the screen, including using built-in functions of the operating system or third-party libraries. The captured screenshots are then typically sent back to the attacker's command and control server. This technique is commonly used by spyware, information stealers, and advanced persistent threats (APTs).

See ATT&CK: Screen Capture (T1113).

Methods

Name	ID	Description
WinAPI	E1113.m01	Screen is captured using WinAPI functions (e.g., user32.GetDesktopWindow).

Use in Malware

Name	Date	Method	Description
GoBotKR	2019	--	GoBotKR is capable of capturing screenshots. [1]
BlackEnergy	2007	--	BlackEnergy's screenshot plugin allows for collection of screenshots. [2]
DarkComet	2008	E1113.m01	DarkComet can take screenshots of the victim's computer. [3] [5]
CHOPSTICK	2015	--	CHOPSTICK takes snapshots of deskop and window contents. [4]
Hupigon	2013	E1113.m01	Malware captures screenshots. [5]
Kovter	2016	E1113.m01	Malware captures screenshots. [5]
Rombertik	2015	E1113.m01	Malware captures screenshots. [5]

Detection

Tool: capa	Mapping	APIs
capture screenshot	Screen Capture::WinAPI (E1113.m01)	user32.GetWindowDC, user32.GetDC, gdi32.CreateDC, gdi32.BitBlt, gdi32.GetDIBits, gdi32.CreateCompatibleDC, gdi32.CreateCompatibleBitmap, user32.GetSystemMetrics = fetch screen dimensions, user32.GetDesktopWindow = get entire desktop, BitBlt, System.Drawing.Graphics::CopyFromScreen
capture screenshot via keybd event	Screen Capture (E1113)	--

Tool: CAPE	Mapping	APIs
poullight_files	Screen Capture (E1113)	--
captures_screenshot	Screen Capture (E1113)	LdrGetProcedureAddress, NtCreateFile

E1113.m01 Snippet

Collection::Screen Capture::WinAPI

SHA256: c6930e298bba86c01d0fe2c8262c46b4fce97c6c5037a193904cfc634246fbec Location: 0x4036de

push    0xcc0020        ; Raster operation code to copy the source rectangle directly onto the destination rectangle
push    0x0     ; y-coordinate of upper left corner of source rectangle
push    0x0     ; x-coordinate of upper left corner of source rectangle
push    dword ptr [esi] ; handle to source device
push    eax     ; height of source/destination rectangles
mov     eax, dword ptr [esi + 0xc]
sub     eax, param_2
sub     param_2, ebx
push    eax     ; width of source/destination rectangles
push    param_1 ; y-coordinate of upper left corner of destination rectangle
push    param_2 ; x-coordinate of upper left corner of destination rectangle
push    dword ptr [ebp + local_28]      ; handle to destingation device
call    dword ptr [->GDI32.DLL::BitBlt] ; Windows API function to transfer a rectangle of pixels from one device to another

References

[1] https://www.welivesecurity.com/2019/07/08/south-korean-users-backdoor-torrents/

[2] https://securelist.com/be2-custom-plugins-router-abuse-and-target-profiles/67353/

[3] https://blog.malwarebytes.com/threat-analysis/2012/06/you-dirty-rat-part-1-darkcomet/

[4] https://web.archive.org/web/20210307034415/https://www.fireeye.com/content/dam/fireeye-www/global/en/current-threats/pdfs/rpt-apt28.pdf

[5] capa v4.0, analyzed at MITRE on 10/12/2022