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webporpose_im.exe

Webporpoise

This is the installer/setup program for a Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The application webporpose_im.exe by Webporpoise has been detected as adware by 7 anti-malware scanners. The program is a setup application that uses the NSIS (Nullsoft Scriptable Install System) installer. It is also typically executed from an Internet Explorer cache folder. The file has been seen being downloaded from secure.ilandcachecdn.com.
Publisher:
Webporpoise  (signed and verified)

MD5:
c812a7f914c7e75d7d89f20d171b371c

SHA-1:
6c796d9cc32c0eb75c08143a6f81525bd6ed216a

SHA-256:
fff3a0fab57e737ce1b10d03b98e080fe5c5b04573141cbd138cdc6c78289b51

Scanner detections:
7 / 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:
4/20/2024 1:02:50 AM UTC  (today)

Scan engine
Detection
Engine version

AVG
Wepor
2015.0.3471

herdProtect (fuzzy)
variant of pacsetup.exe (Adware)
2014.7.8.0

McAfee
Artemis!C812A7F914C7
5600.7127

Reason Heuristics
PUP.Webporpoise.N
14.5.18.10

Rising Antivirus
NS:PUF.SilenceInstaller!1.9DDF
23.00.65.14417

Trend Micro House Call
TROJ_GEN.F47V0325
7.2.109

VIPRE Antivirus
Yontoo
28194

File size:
462.6 KB (473,680 bytes)

File type:
Executable application (Win32 EXE)

Installer:
NSIS (Nullsoft Scriptable Install System)

Common path:
C:\users\{user}\appdata\local\microsoft\windows\temporary internet files\content.ie5\{random}\webporpose_im.exe

Digital Signature
Signed by:
Webporpoise

Authority:
VeriSign, Inc.

Valid from:
3/14/2014 1:00:00 AM

Valid to:
3/15/2015 12:59:59 AM

Subject:
CN=Webporpoise, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=Webporpoise, L=Santa Monica, 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:
77E73438E8DB62CBB923965C646E769F

File PE Metadata
Compilation timestamp:
12/5/2009 11:52:01 PM

OS version:
4.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
6.0

CTPH (ssdeep):
12288:RPp2nb1s15AB/G/8/3D0Fw/tN8dkmLtpHHHrh7w:RPcnb6F8/z0FmcLbH1w

Entry address:
0x30CB

Entry point:
81, EC, 80, 01, 00, 00, 53, 55, 56, 33, DB, 57, 89, 5C, 24, 18, C7, 44, 24, 10, 60, 91, 40, 00, 33, F6, C6, 44, 24, 14, 20, FF, 15, 30, 70, 40, 00, 68, 01, 80, 00, 00, FF, 15, B0, 70, 40, 00, 53, FF, 15, 7C, 72, 40, 00, 6A, 08, A3, 38, 6F, 44, 00, E8, F1, 2B, 00, 00, A3, 84, 6E, 44, 00, 53, 8D, 44, 24, 34, 68, 60, 01, 00, 00, 50, 53, 68, 30, 9C, 42, 00, FF, 15, 58, 71, 40, 00, 68, 54, 91, 40, 00, 68, 80, 2E, 44, 00, E8, A4, 28, 00, 00, FF, 15, AC, 70, 40, 00, BF, 00, F0, 46, 00, 50, 57, E8, 92, 28, 00, 00...
 
[+]

Packer / compiler:
Nullsoft install system v2.x

Code size:
22.5 KB (23,040 bytes)

The file webporpose_im.exe has been seen being distributed by the following URL.

http://secure.ilandcachecdn.com/.../webporpose_im.exe

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