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{a4094039-8a6e-4008-96bd-27b7269968d5}.dll

High Stairs

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The module {a4094039-8a6e-4008-96bd-27b7269968d5}.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:
1.0.5741.39120

MD5:
8d82daa38799917c8c9e30429ffc2567

SHA-1:
3b18a8fbc50b8aa79ddd56b992650090b08c6c30

SHA-256:
3cedc0d11ad038c1c8553b8c65973384019a53a39606fa8c3c40db226e396526

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:
11/24/2024 8:58:56 AM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Yontoo (M)
17.3.16.11

File size:
520.7 KB (533,216 bytes)

Product version:
1.0.5741.39120

File type:
Dynamic link library (Win32 DLL)

Language:
English (United States)

Common path:
C:\users\{user}\appdata\local\temp\{a4094039-8a6e-4008-96bd-27b7269968d5}.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:
9/21/2015 6:44:10 AM

OS version:
5.1

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
12.0

Entry address:
0x1D66C

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 KB (284,672 bytes)

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