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1stbrowser1.exe

1stBrowser Installer

SIEN SA

The application 1stbrowser1.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:
42.0.2311.118

MD5:
fe896e5856f732faca0eb56748927437

SHA-1:
e0765abdb0ffcd0c4cc0b8ebc8180c8b527093c5

SHA-256:
1feea7605a949ff29646d1776d9ba2a44561e17614b58a209febb4e2245ced48

Scanner detections:
1 / 68

Status:
Potentially unwanted

Analysis date:
5/1/2024 4:18:00 PM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Sien.SIENSA.Installer (M)
15.10.30.17

File size:
39.2 MB (41,151,056 bytes)

Product version:
42.0.2311.118

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

File type:
Executable application (Win32 EXE)

Common path:
C:\users\{user}\appdata\local\temp\{random}.tmp\1stbrowser1.exe

Digital Signature
Signed by:
SIEN SA

Authority:
GlobalSign nv-sa

Valid from:
9/14/2015 3:05:56 PM

Valid to:
9/14/2016 3:05:56 PM

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:
10/23/2015 1:20:39 PM

OS version:
5.1

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
12.0

CTPH (ssdeep):
786432:jRHRsaSDGOXB4T3h0I2fmBoKr0O/SRn0gEQffGL0QRCF6ja268XYzi:r6dRiGA/r0O/OfE1fR2Hzi

Entry address:
0x2096

Entry point:
6A, 00, FF, 15, A4, 40, 40, 00, 50, E8, FC, 08, 00, 00, 59, 50, FF, 15, 90, 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, BB, 0C, 00, 00, 8D, 4D, F8, E8, D8, 0C, 00, 00, 84, C0, 0F, 84, 9D, 00, 00, 00, 8D, 4D, F8, E8, D0, 0C, 00, 00, 83, F8, 01, 0F, 82, 8C, 00, 00, 00, 8D, 4D, F8, E8, BF, 0C, 00, 00, 3B, 05, EC, 14, 40, 00, 77, 7C, FF, 36, 33, C0, BB, 04, 01, 00, 00, 66, 89, 45, F4, 66, 89, 85, EC...
 
[+]

Entropy:
8.0000

Packer / compiler:
FASM v1.3x

Code size:
8 KB (8,192 bytes)

The file 1stbrowser1.exe has been seen being distributed by the following URL.

http://vzbucket.go.im/6ae76ba4-7119-45c8-94ed-52f23abece69/build/.../9fcb9cbf-b364-4036-a0b1-c45643b3f904.exe

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