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1stbrowser.exe

1stBrowser Installer

SIEN SA

The application 1stbrowser.exe by SIEN SA has been detected as a potentially unwanted program by 1 anti-malware scanner with very strong indications that the file is a potential threat. This is a setup and installation application and has been known to bundle potentially unwanted software. The file has been seen being downloaded from vzbucket.go.im.
Publisher:
The 1stBrowser Authors  (signed by SIEN SA)

Product:
1stBrowser Installer

Version:
45.0.2454.119

MD5:
ff5b3efb37ea65f1a2822747b7858537

SHA-1:
4140ff1f8ec7f69b4e18673d57b37ba9e50bae6b

SHA-256:
7ce25437cb17f6ebbb7944328db9636849cac0365c9299c69e6ba10fedb33bb9

Scanner detections:
1 / 68

Status:
Potentially unwanted

Analysis date:
12/24/2024 5:01:18 PM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Sien.SIENSA.Installer (M)
16.2.12.21

File size:
39.7 MB (41,603,168 bytes)

Product version:
45.0.2454.119

Copyright:
Copyright 2015 The 1stBrowser Authors. All rights reserved.

File type:
Executable application (Win32 EXE)

Language:
English (United States)

Common path:
C:\users\{user}\appdata\local\temp\{random}.tmp\1stbrowser.exe

Digital Signature
Signed by:
SIEN SA

Authority:
GlobalSign nv-sa

Valid from:
9/14/2015 9:05:56 AM

Valid to:
9/14/2016 9:05:56 AM

Subject:
CN=SIEN SA, O=SIEN SA, L=Paris, C=FR

Issuer:
CN=GlobalSign CodeSigning CA - SHA256 - G2, O=GlobalSign nv-sa, C=BE

Serial number:
11213DB3C4AD369B17F720086E1BBB7BB700

File PE Metadata
Compilation timestamp:
12/21/2015 7:47:48 AM

OS version:
5.1

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
12.0

CTPH (ssdeep):
786432:YzDPMiiSdU3oHn8PIYoLnGedJWjsO1YKD4MDdbyHrsI5k31c8fH:ikOH8PIYo5LE1Y+XRu5kFcQH

Entry address:
0x2137

Entry point:
6A, 00, FF, 15, B4, 40, 40, 00, 50, E8, 98, 09, 00, 00, 59, 50, FF, 15, A0, 40, 40, 00, CC, 55, 8B, EC, 81, EC, 14, 02, 00, 00, 53, 56, 8B, 75, 14, 85, F6, 0F, 84, BE, 00, 00, 00, FF, 75, 08, 8D, 4D, F8, FF, 75, 0C, FF, 75, 10, E8, EE, 0C, 00, 00, 8D, 4D, F8, E8, 0B, 0D, 00, 00, 84, C0, 0F, 84, 9D, 00, 00, 00, 8D, 4D, F8, E8, 03, 0D, 00, 00, 83, F8, 01, 0F, 82, 8C, 00, 00, 00, 8D, 4D, F8, E8, F2, 0C, 00, 00, 3B, 05, E0, 14, 40, 00, 77, 7C, FF, 36, 33, C0, BB, 04, 01, 00, 00, 66, 89, 45, F4, 66, 89, 85, EC...
 
[+]

Packer / compiler:
FASM v1.3x

Code size:
8 KB (8,192 bytes)

The file 1stbrowser.exe has been seen being distributed by the following URL.

http://vzbucket.go.im/6ae76ba4-7119-45c8-94ed-52f23abece69/build/.../eb15dc10-9617-4cb0-b415-dce33809ea9d.exe

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