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Installer.exe Trojan Downloader Analysis

Updated 1 day ago
Checked by Malware Check
installer.exe

Technical Analysis

File Name installer.exe
File Type
PE32 executable (GUI) Intel 80386, for MS Windows
Scanner Version 1.0.220.174
Database Version 2025-07-11 01:00:16 UTC
⚠

Trojan.Win32.Downloader.oa!s1

Malware family: Downloader

Downloader Trojans specialize in retrieving and installing additional malware payloads. Unlike comprehensive malware, they focus specifically on payload delivery rather than direct system damage.
N/A
Detection Rate
5,346,920
File Size (bytes)
2025-07-11
Analysis Date

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File Identification

Hash Type Value Action
MD5
7b75e60cab397f0571dd0523be1a7ddb
SHA1
406adc1c7f7337f2ef40f990a2b456b0a5bb6e25
SHA256
64aac22f1ec71e8fa1cecb649cede7b0aeea8da6fc498bc511647c8ced3681cd
SHA512
0e8bda370e7800ceaec5cf790581d49a8b949218fa46848ce192456789db8d7412856e626f4f6875f519c08c080789e8e462346c0e8119e2c449b019c7bbf83c
ImpHash
778fcbd34bca6e2bc9d14b70477862f0

PE Analysis

Basic Information

▼
Image Base 0x00400000
Entry Point 0x008c795f
Compilation Time 2023-05-13 11:58:23
Checksum 0x005160d1 (Actual: 0x0051dd56)
OS Version 6.0
PEiD Signatures PE32 executable (GUI) Intel 80386, for MS Windows
Digital Signature The expected hash does not match the digest in SpcInfo
Imports 8 libraries
KERNEL32, USER32, GDI32, ole32, OLEAUT32, COMCTL32, COMDLG32, SHELL32
Exports 0 functions
Resources 0 Resources
Sections 7 Sections

PE Sections

▼
Name Virtual Address Virtual Size Raw Size Entropy Characteristics MD5
.text 0x00001000 104,874 bytes 104,960 bytes 6.73 (Compressed) IMAGE_SCN_CNT_CODE|IMAGE_SCN_MEM_EXECUTE|IMAGE_SCN_MEM_READ 537D8F11213D5B894BC6FCF9A585BFE0
.rdata 0x0001b000 332,086 bytes 332,288 bytes 5.65 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ 21553281F3523C87F00039C43A74A404
.data 0x0006d000 24,164 bytes 22,016 bytes 5.31 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE A023A6FD0585F472EE9B67882E571AD6
.6E` 0x00073000 2,512,269 bytes 2,512,384 bytes 7.95 (Packed/Encrypted) IMAGE_SCN_CNT_CODE|IMAGE_SCN_MEM_EXECUTE|IMAGE_SCN_MEM_READ 22911C6EA103F6D4774666AC66CD1CC1
./p> 0x002d9000 1,368 bytes 1,536 bytes 4.20 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE 64D49D71D35ABEEB4BD3CC732D57B047
.<h" 0x002da000 2,315,616 bytes 2,315,776 bytes 7.98 (Packed/Encrypted) IMAGE_SCN_CNT_CODE|IMAGE_SCN_MEM_EXECUTE|IMAGE_SCN_MEM_READ 48A4C5B2DC87EEB7A790D0C8CA17AF2B
.reloc 0x00510000 30,380 bytes 30,720 bytes 6.22 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_DISCARDABLE|IMAGE_SCN_MEM_READ C5C20C22AD269DA600F64274EE7553C0
Entropy Analysis Alert

2 section(s) with high entropy (≥7.5) detected - possible packing/encryption

1 section(s) with elevated entropy (≥6.5) - possible compression

Certificate Chain Analysis

▼
No Digital Signatures

This file is not digitally signed.

Security Implications:
  • Cannot verify the publisher's identity
  • Increased security risk when running this file
  • May trigger security warnings on some systems

⚠ This file either lacks a digital signature or the certificate chain could not be verified
Exercise caution when executing unsigned files from unknown sources

Certificate Verification Status

The expected hash does not match the digest in SpcInfo

Recommendation: Verify the file source and ensure it comes from a trusted publisher.

Trojan.Win32.Downloader.oa!s1 Removal

Gridinsoft has the capability to identify and eliminate Trojan.Win32.Downloader.oa!s1 without requiring further user intervention.

Download Anti-Malware

Removal Instructions

Follow these steps to completely remove the threat from your system

  1. Start by downloading Gridinsoft Anti-Malware to your computer.
  2. Double-click on the gsam-en-install.exe file and follow the on-screen instructions to install the program.
  3. Once the installation of Gridinsoft Anti-Malware is complete, the program will open on the Scan screen.
  4. Click on the "Standard Scan" button to begin scanning your computer for threats.
  5. After the scanning process is finished, click on "Clean Now" to remove any detected threats.
  6. If prompted, restart your system to complete the removal process and ensure all threats are eliminated.
Important: Before You Start
Disconnect from the internet to prevent the malware from spreading or downloading additional threats. Run the scan in Safe Mode for better detection and removal of persistent threats.

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