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Up_zlib1.dll Trojan Agent Analysis

Updated 2 days ago
Checked by Malware Check
up_zlib1.dll

Technical Analysis

File Name up_zlib1.dll
File Type
PE32 executable (DLL) (console) Intel 80386, for MS Windows, UPX compressed
Scanner Version 1.0.259.174
Database Version 2026-11-06 04:07:02 UTC
⚠

Trojan.Win32.Agent.cld

Malware family: Agent

Trojan Agent malware disguises itself as legitimate software while performing unauthorized activities including data theft and providing remote system access to threat actors.
N/A
Detection Rate
526,488
File Size (bytes)
2026-11-06
Analysis Date

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File Identification

Hash Type Value Action
MD5
a28cebf2ef0aebb79ede6133218cf8dd
SHA1
b1e108994980773fe199becbbe46b203fe5691b6
SHA256
104691a4841e51f84462f638c6a4071cc99e58b3115c2d02708aedc9394530a1
SHA512
687fd49d790211855fefd6811cb5fa8ac883ea7b22aef25c1e0925d77d0e1242f326f5b39b2aa10d00a759ff752f57bc24b360507fad9f20b858d9d1302594d5
ImpHash
3861174c7cca64e1a0a5e22b4205263f

PE Analysis

Basic Information

▼
Image Base 0x10000000
Entry Point 0x1019c570
Compilation Time 2015-11-03 08:31:18
Checksum 0x000873bc (Actual: 0x000873bc)
OS Version 5.1
PEiD Signatures PE32 executable (DLL) (console) Intel 80386, for MS Windows, UPX compressed
Digital Signature OK
Imports 15 libraries
Exports 62 functions
Resources 2 Resources
Sections 3 Sections

Version Information

▼
FileVersion 1.0.0.0
LegalCopyright Copyright (C) 2014
ProductVersion 1.0.0.0
Translation 0x0804 0x04b0

PE Sections

▼
Name Virtual Address Virtual Size Raw Size Entropy Characteristics MD5
UPX0 0x00001000 1,171,456 bytes 0 bytes 0.00 (Normal) IMAGE_SCN_CNT_UNINITIALIZED_DATA|IMAGE_SCN_MEM_EXECUTE|IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE D41D8CD98F00B204E9800998ECF8427E
UPX1 0x0011f000 520,192 bytes 516,608 bytes 8.00 (Packed/Encrypted) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_EXECUTE|IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE FC5BF87824B0DC80C3E7C6C674001D34
.rsrc 0x0019e000 4,096 bytes 3,584 bytes 5.13 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE A6B5FFEBCECC80B55C2DE9225026FCC9
Entropy Analysis Alert

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

Resource Analysis

▼
Total Resources: 2 (742 bytes)
Resource Type Count Total Size Percentage
RT_VERSION 1 396 bytes
53.4%
RT_MANIFEST 1 346 bytes
46.6%

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

OK

Trojan.Win32.Agent.cld Removal

Gridinsoft has the capability to identify and eliminate Trojan.Win32.Agent.cld without requiring further user intervention.

Download Anti-Malware

Removal Instructions

Follow these steps to completely remove the threat from your system

  1. 1
    Get Gridinsoft Anti-Malware — it's a quick 2 MB download that won't slow down your PC.
  2. 2
    Run the installer gsam-en-install.exe. The setup takes about 2 minutes and doesn't require a restart.
  3. 3
    The app launches right after installation. You'll see the main dashboard with the scan button front and center.
  4. 4
    Hit "Standard Scan" — this checks all the spots where malware typically hides: temp folders, browser data, startup programs, and system directories.
  5. 5
    Once the scan finds this threat, click "Clean Now". The removal usually happens instantly, though some stubborn infections may need a reboot.
  6. 6
    If you see a restart prompt, go ahead and reboot. This clears any malware that was running in memory and ensures your system starts fresh.
Important: Before You Start
Quick tip: unplug from the internet before scanning. Some malware phones home for instructions or downloads extra payloads when it senses trouble. If the infection is severe, boot into Safe Mode first — it limits what can run and makes cleanup easier.

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