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{9c3bcfdd-4b23-47bb-9fd2-661640edaf50}.dll

High Stairs

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The module {9c3bcfdd-4b23-47bb-9fd2-661640edaf50}.dll by High Stairs has been detected as adware by 1 anti-malware scanner with very strong indications that the file is a potential threat. It is also typically executed from the user's temporary directory.
Publisher:
High Stairs  (signed and verified)

Version:
1.0.5740.10347

MD5:
084e484861259ab2046a5a9c8340f4b8

SHA-1:
f729db2db1412ca0975d92fbe0b6e4ab9b9db508

SHA-256:
c8515bfc9f4e44612abe4a24097ef31a8f26169baf67c9c65d4d3f0fe773655a

Scanner detections:
1 / 68

Status:
Adware

Explanation:
Belongs to the Sambreel/Yontoo progam that inserts various forms of advertising in the user's web browser, installed with minimal or no user consent.

Analysis date:
4/18/2024 10:49:07 AM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Yontoo (M)
17.3.16.11

File size:
521.2 KB (533,728 bytes)

Product version:
1.0.5740.10347

File type:
Dynamic link library (Win32 DLL)

Language:
English (United States)

Common path:
C:\users\{user}\appdata\local\temp\{9c3bcfdd-4b23-47bb-9fd2-661640edaf50}.dll

Digital Signature
Signed by:
High Stairs

Authority:
VeriSign, Inc.

Valid from:
6/8/2015 2:00:00 AM

Valid to:
6/8/2016 1:59:59 AM

Subject:
CN=High Stairs, O=High Stairs, L=San Diego, S=California, C=US

Issuer:
CN=VeriSign Class 3 Code Signing 2010 CA, OU=Terms of use at https://www.verisign.com/rpa (c)10, OU=VeriSign Trust Network, O="VeriSign, Inc.", C=US

Serial number:
6698E8E8576717D380DB0BBF631821E1

File PE Metadata
Compilation timestamp:
9/19/2015 2:45:02 PM

OS version:
5.1

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
12.0

Entry address:
0x1D75C

Entry point:
55, 8B, EC, 83, 7D, 0C, 01, 75, 05, E8, A2, 8D, 00, 00, FF, 75, 10, FF, 75, 0C, FF, 75, 08, E8, 07, 00, 00, 00, 83, C4, 0C, 5D, C2, 0C, 00, 6A, 0C, 68, 10, 39, 05, 10, E8, 75, 2E, 00, 00, 33, C0, 40, 8B, 75, 0C, 85, F6, 75, 0C, 39, 35, CC, DF, 07, 10, 0F, 84, E4, 00, 00, 00, 83, 65, FC, 00, 83, FE, 01, 74, 05, 83, FE, 02, 75, 35, 8B, 0D, BC, 75, 04, 10, 85, C9, 74, 0C, FF, 75, 10, 56, FF, 75, 08, FF, D1, 89, 45, E4, 85, C0, 0F, 84, B1, 00, 00, 00, FF, 75, 10, 56, FF, 75, 08, E8, 11, FE, FF, FF, 89, 45, E4...
 
[+]

Developed / compiled with:
Microsoft Visual C++

Code size:
278.5 KB (285,184 bytes)

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