Pr1.exe Backdoor Generic Analysis

Updated 2 hours ago

Checked by Malware Check

pr1.exe

Technical Analysis

File Name	pr1.exe
File Type	PE32 executable (GUI) Intel 80386 (stripped to external PDB), for MS Windows
Scanner Version	1.0.254.174
Database Version	2026-09-21 16:01:28 UTC

⚠

Backdoor.Win32.Generic.oa!s1

Malware family: Generic

This detection name identifies suspicious files displaying Trojan-like behavior patterns. It represents malware that masquerades as benign programs while executing unauthorized activities on the infected system.

N/A

Detection Rate

2,035,244

File Size (bytes)

2026-09-21

Analysis Date

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File Identification

Hash Type	Value	Action
MD5	d87a65c6822d1cce2a15237edfcba355
SHA1	5422fddddc2750b09c30ccd5a45ef4da056af8e9
SHA256	c521ccd369d399c3c87ab1b6d3f9aa8c91f70ef4331fd1cea6413125258c6b00
SHA512	7a43ff5a38da450069915cad7770982f3a0d2d437423a1cc19104ba5fb11dacae85678b8d1bd67b7241876e33ce3927a0bcf40efc8fff92e81815637c2aa63a5
ImpHash	818d3fa86f016cd06e99e723413c3e0d

PE Analysis

Basic Information

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Icon	Hash: 6aa1e191a9aff15ea6d9b9a20b00609f Fuzzy: fd10dbccdae6fa9597b1bfcce4c0e58c dHash: 818da080a0a080a0
Image Base	`0x00400000`
Entry Point	`0x00401000`
Compilation Time	2005-06-02 10:36:26
Checksum	0x00000000 (Actual: 0x001ffcd5)
OS Version	4.0
PEiD Signatures	`PE32 executable (GUI) Intel 80386 (stripped to external PDB), for MS Windows`
Digital Signature	No valid SignedData structure was found.
Imports	14 libraries
Exports	531 functions
Resources	6 Resources
Sections	8 Sections

PE Sections

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Name	Virtual Address	Virtual Size	Raw Size	Entropy	Characteristics	MD5
`.text`	`0x00001000`	757,760 bytes	755,200 bytes	6.49 (Normal)	`IMAGE_SCN_CNT_CODE\|IMAGE_SCN_MEM_EXECUTE\|IMAGE_SCN_MEM_READ`	`3C70391818008D47B60B741276CF8CAA`
`.data`	`0x000ba000`	1,200,128 bytes	1,180,160 bytes	0.93 (Normal)	`IMAGE_SCN_CNT_INITIALIZED_DATA\|IMAGE_SCN_MEM_READ\|IMAGE_SCN_MEM_WRITE`	`6F23435ABB6EB2D702B142C2BD0F45AA`
`.tls`	`0x001df000`	4,096 bytes	512 bytes	0.00 (Normal)	`IMAGE_SCN_CNT_INITIALIZED_DATA\|IMAGE_SCN_MEM_READ\|IMAGE_SCN_MEM_WRITE`	`BF619EAC0CDF3F68D496EA9344137E8B`
`.rdata`	`0x001e0000`	4,096 bytes	512 bytes	0.19 (Normal)	`IMAGE_SCN_CNT_INITIALIZED_DATA\|IMAGE_SCN_MEM_SHARED\|IMAGE_SCN_MEM_READ`	`8D32A853890BAF863D4B5C8F1FB155F0`
`.idata`	`0x001e1000`	12,288 bytes	12,288 bytes	4.51 (Normal)	`IMAGE_SCN_CNT_INITIALIZED_DATA\|IMAGE_SCN_MEM_READ`	`F7A11E40B32DC11EB795D6EB01B7D5B1`
`.edata`	`0x001e4000`	32,768 bytes	30,208 bytes	5.59 (Normal)	`IMAGE_SCN_CNT_INITIALIZED_DATA\|IMAGE_SCN_MEM_READ`	`C507939605C361CD7DC7A185F28A5E7A`
`.rsrc`	`0x001ec000`	7,328 bytes	7,680 bytes	4.88 (Normal)	`IMAGE_SCN_CNT_INITIALIZED_DATA\|IMAGE_SCN_MEM_READ`	`DA37BAD809F8B3A44EA58773DB6ABAB1`
`.reloc`	`0x001ee000`	49,152 bytes	47,104 bytes	0.00 (Normal)	`IMAGE_SCN_CNT_INITIALIZED_DATA\|IMAGE_SCN_MEM_SHARED\|IMAGE_SCN_MEM_READ`	`B13FCB3223116F6EEC60BE9143CAE98B`

Resource Analysis

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Total Resources: 6 (6,871 bytes)

Resource Type	Count	Total Size	Percentage
RT_ICON	1	2,216 bytes	32.3%
RT_RCDATA	4	4,635 bytes	67.5%
RT_GROUP_ICON	1	20 bytes	0.3%

Certificate Chain Analysis

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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.

Backdoor.Win32.Generic.oa!s1 Removal

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

Download Anti-Malware

Removal Instructions

Follow these steps to completely remove the threat from your system

1
Get Gridinsoft Anti-Malware — it's a quick 2 MB download that won't slow down your PC.
2
Run the installer gsam-en-install.exe. The setup takes about 2 minutes and doesn't require a restart.
3
The app launches right after installation. You'll see the main dashboard with the scan button front and center.
4
Hit "Standard Scan" — this checks all the spots where malware typically hides: temp folders, browser data, startup programs, and system directories.
5
Once the scan finds this threat, click "Clean Now". The removal usually happens instantly, though some stubborn infections may need a reboot.
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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