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Zsync.exe Trojan Downloader Analysis

Updated 10 days ago
Checked by Malware Check
zsync.exe

Technical Analysis

File Name zsync.exe
File Type
PE32 executable (GUI) Intel 80386, for MS Windows
Scanner Version 1.0.231.174
Database Version 2025-12-29 16:00:39 UTC
⚠

Trojan.Win32.Downloader.mz!n

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
865,792
File Size (bytes)
2025-12-29
Analysis Date

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File Identification

Hash Type Value Action
MD5
bb77993dad29723ceb70d188a6f60a11
SHA1
c4c6a4786a26a21635d1acc295bfecd4c169472a
SHA256
f903ba6629fd0fb95981a87ceb540448dec07d4b09108ab695bc5a723fc95422
SHA512
36d85117204e6e4ba4b6f17d93a4445286c6884cca112f20fc34923009a4673dee6c2d0573a033d0ee1cfc7b4b712827e76f54720e62545e87223acaf2fc42da
ImpHash
332f7ce65ead0adfb3d35147033aabe9

PE Analysis

Basic Information

▼
Icon
Hash: b78b57aaeaee68700142524bf24e9500
Fuzzy: 319d556776bbfe81edfaa340be2db5d0
dHash: 96969b7baea431ad
Image Base 0x00400000
Entry Point 0x0049ab80
Compilation Time 1992-06-19 22:22:17
Checksum 0x00000000 (Actual: 0x000e011b)
OS Version 4.0
PEiD Signatures PE32 executable (GUI) Intel 80386, for MS Windows
Digital Signature No valid SignedData structure was found.
Imports 12 libraries
Exports 0 functions
Resources 62 Resources
Sections 8 Sections

Version Information

▼
CompanyName Synaptics
FileDescription Synaptics Pointing Device Driver
FileVersion 1.0.0.4
InternalName
LegalCopyright
LegalTrademarks
OriginalFilename
ProductName Synaptics Pointing Device Driver
ProductVersion 1.0.0.0
Comments
Translation 0x041f 0x04e6

PE Sections

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Name Virtual Address Virtual Size Raw Size Entropy Characteristics MD5
CODE 0x00001000 629,740 bytes 629,760 bytes 6.57 (Compressed) IMAGE_SCN_CNT_CODE|IMAGE_SCN_MEM_EXECUTE|IMAGE_SCN_MEM_READ 33FBE30E8A64654287EDD1BF05AE7C8C
DATA 0x0009b000 11,860 bytes 12,288 bytes 4.85 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE 1F5E19E7D20C1D128443D738AC7BC610
BSS 0x0009e000 4,581 bytes 0 bytes 0.00 (Normal) IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE D41D8CD98F00B204E9800998ECF8427E
.idata 0x000a0000 10,818 bytes 11,264 bytes 4.92 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE 21FF53180B390DC06E3A1ADF0E57A073
.tls 0x000a3000 16 bytes 0 bytes 0.00 (Normal) IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE D41D8CD98F00B204E9800998ECF8427E
.rdata 0x000a4000 57 bytes 512 bytes 0.78 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_SHARED|IMAGE_SCN_MEM_READ A92CF494C617731A527994013429AD97
.reloc 0x000a5000 43,392 bytes 43,520 bytes 6.67 (Compressed) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_SHARED|IMAGE_SCN_MEM_READ DCD1B1C3F3D28D444920211170D1E8E6
.rsrc 0x000b0000 167,216 bytes 167,424 bytes 6.40 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_SHARED|IMAGE_SCN_MEM_READ 196E4602320D71FE7FC93B6E82F6A07F
Entropy Analysis Alert

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

Resource Analysis

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Total Resources: 62 (163,683 bytes)
Resource Type Count Total Size Percentage
RT_CURSOR 7 2,156 bytes
1.3%
RT_BITMAP 11 4,892 bytes
3%
RT_ICON 2 8,528 bytes
5.2%
RT_DIALOG 1 82 bytes
0.1%
RT_STRING 24 17,100 bytes
10.4%
RT_RCDATA 8 129,993 bytes
79.4%
RT_GROUP_CURSOR 7 140 bytes
0.1%
RT_GROUP_ICON 1 20 bytes
0%
RT_VERSION 1 772 bytes
0.5%

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

No valid SignedData structure was found.

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

Trojan.Win32.Downloader.mz!n Removal

Gridinsoft has the capability to identify and eliminate Trojan.Win32.Downloader.mz!n 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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