Threat Database Trojans Trojan.Rugmi.FF

Trojan.Rugmi.FF

By CagedTech in Trojans
Published:

Threat Scorecard

Popularity Rank: 8
Threat Level: 80 % (High)
Infected Computers: 16,671
First Seen: August 13, 2025
Last Seen: October 23, 2026
OS(es) Affected: Windows

Trojan.Rugmi.FF is a dangerous Windows-based Trojan designed to quietly infiltrate computers, operate without detection, and open the door for further malicious activity. With a danger level rated 8 out of 10, Rugmi.FF poses a serious risk to both personal and business systems, functioning primarily as a loader or downloader that paves the way for additional malware to be installed on an infected device.

What Trojan.Rugmi.FF Does

Once active on a system, Rugmi.FF runs silently in the background, attempting to avoid detection by security tools and the user alike. It is capable of performing a range of harmful functions, including deleting files, installing additional malicious payloads, and potentially giving remote attackers a high degree of control over the infected machine. Interestingly, this threat has been observed disguising itself using file information associated with legitimate Python software components, likely in an attempt to appear trustworthy and evade suspicion from both users and basic security scans. Despite this disguise, the file's actual digital signature does not match what it claims to be, a strong indicator of tampering.

Behind the scenes, Rugmi.FF leverages low-level Windows system functions to manipulate memory, execute processes, and interact with the operating system in ways that are not typical for legitimate software. It has also been seen launching system utilities, such as rundll32.exe, in unusual and automated ways to execute its malicious code while blending in with normal system operations.

How It Usually Spreads

Like many Trojans in this category, Rugmi.FF typically gains access to computers through deceptive or exploitative methods. It is commonly distributed via malicious or compromised websites offering software downloads, or through email attachments sent from untrusted or spoofed sources. These attachments may be disguised with misleading file extensions such as .exe, .pif, .avi, or even .jpg files to trick users into opening them. In some cases, this Trojan may also exploit unpatched system vulnerabilities to install itself without any direct action from the user.

Risks for Users

The presence of Rugmi.FF on a system can lead to serious consequences. Because it may allow attackers to gain significant control over the infected device, users risk having personal data stolen, additional malware silently installed, and important files deleted or altered without their knowledge. Given its stealthy nature, victims often remain unaware of the infection until damage has already occurred, such as financial loss, identity theft, or further compromise of the system through secondary malware infections.

Signs of Infection

Because Rugmi.FF is built to operate covertly, visible symptoms may be minimal or easily overlooked. However, users should watch for unusual system slowdowns, unexpected background processes, unfamiliar files appearing in system folders, or unexplained changes to system settings. Suspicious use of built-in Windows tools, like rundll32.exe, running at odd times or with unusual parameters, can also indicate the presence of this type of threat.

How to Stay Protected

To reduce the risk of infection, users should avoid downloading software from unofficial or unverified websites and refrain from opening email attachments from unknown or suspicious senders. Keeping the Windows operating system and all installed software fully updated helps close security gaps that threats like Rugmi.FF often exploit. Running reputable, up-to-date security software and performing regular system scans can help detect and remove threats before they cause significant harm. Practicing caution online and maintaining regular backups of important files further strengthens protection against this type of Trojan.

Analysis Report

General information

Family Name: Trojan.Rugmi.FF
Signature status: Hash Mismatch

Known Samples

MD5: cbe8e89ac374da5f51a6eb2239315f1e
SHA1: 63e91ee13f25a43410e54f4601cd30200e5842b8
SHA256: F4DA0C4CB82D0042F8C327D41ABF8DFCC5A2AC60589E40933E35059871BDF44A
File Size: 3.30 MB, 3297944 bytes

Windows Portable Executable Attributes

  • File doesn't have "Rich" header
  • File has exports table
  • File is 32-bit executable
  • File is either console or GUI application
  • File is GUI application (IMAGE_SUBSYSTEM_WINDOWS_GUI)
  • File is Native application (NOT .NET application)
  • File is not packed
  • IMAGE_FILE_DLL is not set inside PE header (Executable)
  • IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)

Windows PE Version Information

Name Value
Company Name Python Software Foundation
File Description Python Core
File Version 3.6.3
Internal Name Python DLL
Legal Copyright Copyright © 2001-2016 Python Software Foundation. Copyright © 2000 BeOpen.com. Copyright © 1995-2001 CNRI. Copyright © 1991-1995 SMC.
Original Filename python36.dll
Product Name Python
Product Version 3.6.3

Digital Signatures

Signer Root Status
Python Software Foundation StartCom Class 3 Object CA Hash Mismatch

File Traits

  • dll
  • HighEntropy
  • x86

Block Information

Total Blocks: 8,698
Potentially Malicious Blocks: 6
Whitelisted Blocks: 8,689
Unknown Blocks: 3

Visual Map

... Data truncated
0 - Probable Safe Block
? - Unknown Block
x - Potentially Malicious Block

Similar Families

  • Rugmi.FC
  • Rugmi.FF
  • Rugmi.OO
  • Trojan.Downloader.Gen.AVR

Files Modified

File Attributes
c:\users\user\appdata\local\microsoft\windows\usrclass.dat{dba6b5ef-640a-11ed-9bcb-f677369d361c}.txr.1.regtrans-ms Generic Read,Write Data,Write Attributes,Write extended,Append data
c:\users\user\appdata\local\microsoft\windows\usrclass.dat{dba6b5ef-640a-11ed-9bcb-f677369d361c}.txr.2.regtrans-ms Generic Read,Write Data,Write Attributes,Write extended,Append data

Windows API Usage

Category API
Syscall Use
  • ntdll.dll!NtAlpcSendWaitReceivePort
  • ntdll.dll!NtClose
  • ntdll.dll!NtCreateFile
  • ntdll.dll!NtCreateSection
  • ntdll.dll!NtFreeVirtualMemory
  • ntdll.dll!NtMapViewOfSection
  • ntdll.dll!NtOpenFile
  • ntdll.dll!NtOpenKey
  • ntdll.dll!NtOpenProcessToken
  • ntdll.dll!NtQueryAttributesFile
Show 17 more
  • ntdll.dll!NtQueryDebugFilterState
  • ntdll.dll!NtQueryInformationProcess
  • ntdll.dll!NtQueryInformationToken
  • ntdll.dll!NtQuerySystemInformationEx
  • ntdll.dll!NtQueryValueKey
  • ntdll.dll!NtQueryVirtualMemory
  • ntdll.dll!NtQueryVolumeInformationFile
  • ntdll.dll!NtReadFile
  • ntdll.dll!NtSetEvent
  • ntdll.dll!NtSetInformationFile
  • ntdll.dll!NtSetInformationProcess
  • ntdll.dll!NtSetInformationVirtualMemory
  • ntdll.dll!NtSetInformationWorkerFactory
  • ntdll.dll!NtTestAlert
  • ntdll.dll!NtTraceControl
  • ntdll.dll!NtUnmapViewOfSection
  • ntdll.dll!NtWriteFile
Process Manipulation Evasion
  • NtUnmapViewOfSection
Process Shell Execute
  • CreateProcess
Anti Debug
  • NtQuerySystemInformation

Shell Command Execution

C:\WINDOWS\SysWOW64\rundll32.exe C:\WINDOWS\system32\rundll32.exe c:\users\user\downloads\63e91ee13f25a43410e54f4601cd30200e5842b8_0003297944.,LiQMAxHB