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vstub.exe

Wajamu

The file is part of Wajam, a web browser extension that injects social search integration into various search portals such as Google. The application vstub.exe by Wajamu has been detected as adware by 19 anti-malware scanners. It is also typically executed from an Internet Explorer cache folder. The file has been seen being downloaded from vzbucket.maxrevinstaller.com and multiple other hosts.
Publisher:
Wajamu  (signed and verified)

MD5:
43e4fab591a3a9b668f231c2d1df86e9

SHA-1:
7ef283e1102bf79571f86286f9d54564c134d09d

SHA-256:
b88f9e79d8ef982dfb457ea5c2049c760544fe09fd46d78f592a33565ddd7042

Scanner detections:
19 / 68

Status:
Adware

Analysis date:
1/11/2025 9:23:12 PM UTC  (today)

Scan engine
Detection
Engine version

Lavasoft Ad-Aware
Gen:Variant.Kazy.461155
786

Agnitum Outpost
Trojan.DL.Agent
7.1.1

AVG
Generic
2015.0.3264

Bitdefender
Gen:Variant.Kazy.461155
1.0.20.1725

Dr.Web
Adware.Shopper.423
9.0.1.0140

Emsisoft Anti-Malware
Gen:Variant.Kazy.461155
8.14.12.11.12

Fortinet FortiGate
W32/Agent.HEXG!tr.dldr
12/11/2014

F-Secure
Gen:Variant.Kazy.461155
11.2014-11-12_5

G Data
Gen:Variant.Kazy.461155
14.12.24

IKARUS anti.virus
not-a-virus:Downloader.Agent
t3scan.1.7.8.0

Kaspersky
Trojan-Downloader.Win32.Agent
14.0.0.2815

Malwarebytes
PUP.Optional.VBates.A
v2014.05.20.10

McAfee
Artemis!EAE451558E67
5600.6920

MicroWorld eScan
Gen:Variant.Kazy.461155
15.0.0.1035

nProtect
Trojan-Downloader/W32.Agent.266064
14.09.29.01

Panda Antivirus
Trj/CI.A
14.12.11.12

Reason Heuristics
PUP.Wajamu.F
14.5.20.10

Sophos
V-Bates
4.98

Zillya! Antivirus
Downloader.Agent.Win32.221388
2.0.0.1938

File size:
259.4 KB (265,576 bytes)

File type:
Executable application (Win32 EXE)

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

Digital Signature
Signed by:
Wajamu

Authority:
Thawte, Inc.

Valid from:
8/26/2013 9:30:00 AM

Valid to:
8/27/2014 9:29:59 AM

Subject:
CN=Wajamu, O=Wajamu, L=Herzlia, S=Israel, C=IL

Issuer:
CN=Thawte Code Signing CA - G2, O="Thawte, Inc.", C=US

Serial number:
254859747F512412BB92CB81D0C020A7

File PE Metadata
Compilation timestamp:
5/19/2014 10:14:32 PM

OS version:
5.1

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
11.0

CTPH (ssdeep):
3072:HEzppZb1FYTEir3Mj2DoIB+f622ZAqqqqWtW3w0pUPZ60msnru+vikMPLdKfo0dS:HEVpWIibwWvBfDtW3wKkRdS

Entry address:
0x8EF3

Entry point:
E8, A4, 94, 00, 00, E9, 00, 00, 00, 00, 6A, 14, 68, 50, 57, 42, 00, E8, 97, 52, 00, 00, E8, 30, 29, 00, 00, 0F, B7, F0, 6A, 02, E8, 37, 94, 00, 00, 59, B8, 4D, 5A, 00, 00, 66, 39, 05, 00, 00, 40, 00, 74, 04, 33, DB, EB, 33, A1, 3C, 00, 40, 00, 81, B8, 00, 00, 40, 00, 50, 45, 00, 00, 75, EB, B9, 0B, 01, 00, 00, 66, 39, 88, 18, 00, 40, 00, 75, DD, 33, DB, 83, B8, 74, 00, 40, 00, 0E, 76, 09, 39, 98, E8, 00, 40, 00, 0F, 95, C3, 89, 5D, E4, E8, 38, 50, 00, 00, 85, C0, 75, 08, 6A, 1C, E8, DC, 00, 00, 00, 59, E8...
 
[+]

Entropy:
5.5005

Code size:
114 KB (116,736 bytes)

The file vstub.exe has been seen being distributed by the following 2 URLs.

http://vzbucket.maxrevinstaller.com/VBates/.../vstub.exe

http://24b9c2b31b06c472fcca-681664e3535063ecf3a37aa4fc97770c.r32.cf5.rackcdn.com/prime/.../vstub.exe

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