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793f35a.tmp

Yontoo

Yontoo LLC

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file 793f35a.tmp by Yontoo has been detected as adware by 14 anti-malware scanners. It is also typically executed from the user's temporary directory. The file has been seen being downloaded from dl.kbm2.com and multiple other hosts.
Publisher:
Yontoo LLC  (signed and verified)

Product:
Yontoo

Description:
Installer

Version:
2012.8.10.1329

MD5:
5d4ea25746448a8f75b57816569b24e7

SHA-1:
55693c2a5ed9bd1bfcdb0928b5a3a8dfb92d9b16

SHA-256:
978744141ef710f85656c6d9c3510e791fdab38326c5a845cd8611c28924e3a9

Scanner detections:
14 / 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:
4/24/2024 2:28:58 AM UTC  (today)

Scan engine
Detection
Engine version

Agnitum Outpost
Adware.Yontoo
7.1.1

Avira AntiVirus
ADWARE/Yontoo.Gen
7.11.145.40

Baidu Antivirus
Adware.Win32.Yontoo
4.0.3.14926

Comodo Security
Heur.Suspicious
18160

Dr.Web
Adware.Siggen.24249
9.0.1.0269

ESET NOD32
Win32/Adware.Yontoo (variant)
8.9717

Fortinet FortiGate
Riskware/Yontoo
9/26/2014

IKARUS anti.virus
AdWare.Yontoo
t3scan.1.6.1.0

NANO AntiVirus
Trojan.Html.Plugin.bopldg
0.28.0.59492

Norman
Yontoo.BG
11.20140926

Qihoo 360 Security
Win32/Trojan.845
1.0.0.1015

Reason Heuristics
PUP.Installer.Yontoo.K
14.9.26.16

VIPRE Antivirus
Yontoo
28570

XVirus List
Win32.Detected
2.9.26

File size:
1 MB (1,055,240 bytes)

Product version:
1.10.02

Copyright:
Copyright (c) 2012 Yontoo LLC. All rights reserved.

Language:
Language Neutral

Common path:
C:\users\{user}\appdata\local\temp\793f35a.tmp

Digital Signature
Signed by:
Yontoo LLC

Authority:
VeriSign, Inc.

Valid from:
12/7/2011 3:00:00 AM

Valid to:
12/7/2012 2:59:00 AM

Subject:
CN=Yontoo LLC, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=Yontoo LLC, L=Carlsbad, 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:
4F8617352536F013088C9B5533AA4440

File PE Metadata
Compilation timestamp:
3/11/2011 5:55:32 AM

OS version:
4.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
8.0

CTPH (ssdeep):
24576:6tDklnJPxN3navSBX5MfAeqiG2Z2Ycn3vPXnV:WSnThXmXSfPXnV

Entry address:
0x1627

Entry point:
55, 8B, EC, 81, EC, 58, 0B, 00, 00, 53, 56, 33, DB, 57, 66, 89, 9D, A8, F4, FF, FF, 89, 5D, FC, FF, 15, 74, 30, 40, 00, A3, 00, 40, 40, 00, FF, 15, 70, 30, 40, 00, 89, 45, F8, 8D, 85, B8, FC, FF, FF, 50, C7, 85, B8, FC, FF, FF, 14, 01, 00, 00, FF, 15, 6C, 30, 40, 00, 85, C0, 75, 21, FF, 15, 14, 30, 40, 00, 50, 68, 30, 34, 40, 00, E8, 40, FA, FF, FF, 59, C7, 05, 04, 40, 40, 00, FF, 00, 00, 00, E9, C5, 01, 00, 00, 68, 1C, 34, 40, 00, 68, 0C, 34, 40, 00, FF, 15, 68, 30, 40, 00, 50, FF, 15, 64, 30, 40, 00, 3B...
 
[+]

Entropy:
7.9955

Developed / compiled with:
Microsoft Visual C++

Code size:
7.5 KB (7,680 bytes)

The file 793f35a.tmp has been seen being distributed by the following 2 URLs.

http://dl.kbm2.com/.../?beta=b0cQF35cWmATAR4zD0I7dktBfzcHE3kdcy5KD0UqP3hQOWkKSxgxYzkaFU4g

http://dl.kbm2.com/download/.../20120816.exe

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