STOP.KOOM Ransomware
Threat Scorecard
EnigmaSoft Threat Scorecard
EnigmaSoft Threat Scorecards are assessment reports for different malware threats which have been collected and analyzed by our research team. EnigmaSoft Threat Scorecards evaluate and rank threats using several metrics including real-world and potential risk factors, trends, frequency, prevalence, and persistence. EnigmaSoft Threat Scorecards are updated regularly based on our research data and metrics and are useful for a wide range of computer users, from end users seeking solutions to remove malware from their systems to security experts analyzing threats.
EnigmaSoft Threat Scorecards display a variety of useful information, including:
Popularity Rank: The ranking of a particular threat in EnigmaSoft’s Threat Database.
Severity Level: The determined severity level of an object, represented numerically, based on our risk modeling process and research, as explained in our Threat Assessment Criteria.
Infected Computers: The number of confirmed and suspected cases of a particular threat detected on infected computers as reported by SpyHunter.
See also Threat Assessment Criteria.
| Popularity Rank: | 10,067 |
| Threat Level: | 100 % (High) |
| Infected Computers: | 27,518 |
| First Seen: | August 3, 2021 |
| Last Seen: | November 29, 2025 |
| OS(es) Affected: | Windows |
Table of Contents
Analysis Report
General information
| Family Name: | STOP.KOOM Ransomware |
|---|---|
| Signature status: | No Signature |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
ff94c36af01c8dfc154452b8dbc9a1e3
SHA1:
ecbecc963275cd1224b6ed57045a18c5f4c1789f
SHA256:
52F0FF0DCF5D515B32EDFD7CC0F2E4610F60BEF7D20FE8434024C89666C18167
File Size:
398.85 KB, 398848 bytes
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MD5:
b32f214ded41b0d790c86a7ecea71112
SHA1:
f95df48c373e1124b2d4a3e62c6e99e3ef53d6f5
SHA256:
1D11AD9F46BA8D4D2AE5CDFD88A9AEE19060D655DBCEBCC1588676A8638142EE
File Size:
4.62 MB, 4622376 bytes
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MD5:
d384ed0f4e3d757cb839f62a9b1c5167
SHA1:
241f25035ab9db87b03f3ca3faca3ea37f0ba842
SHA256:
C63AE4BDDB12A82C643F560BFFA1CA686CF3CA083648C47D08171DF632F5F394
File Size:
340.48 KB, 340480 bytes
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Windows Portable Executable Attributes
- File doesn't have "Rich" header
- File doesn't have exports table
- File doesn't have relocations information
- File doesn't have security information
- File is 32-bit executable
- File is console application (IMAGE_SUBSYSTEM_WINDOWS_CUI)
- 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
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- IMAGE_FILE_DLL is not set inside PE header (Executable)
- IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)
File Icons
File Icons
This section displays icon resources found within family samples. Malware often replicates icons commonly associated with legitimate software to mislead users into believing the malware is safe.
File Traits
- HighEntropy
- No Version Info
- x86
Block Information
Block Information
During analysis, EnigmaSoft breaks file samples into logical blocks for classification and comparison with other samples. Blocks can be used to generate malware detection rules and to group file samples into families based on shared source code, functionality and other distinguishing attributes and characteristics. This section lists a summary of this block data, as well as its classification by EnigmaSoft. A visual representation of the block data is also displayed, where available.| Total Blocks: | 567 |
|---|---|
| Potentially Malicious Blocks: | 4 |
| Whitelisted Blocks: | 557 |
| Unknown Blocks: | 6 |
Visual Map
? - Unknown Block
x - Potentially Malicious Block
Similar Families
Similar Families
This section lists other families that share similarities with this family, based on EnigmaSoft’s analysis. Many malware families are created from the same malware toolkits and use the same packing and encryption techniques but uniquely extend functionality. Similar families may also share source code, attributes, icons, subcomponents, compromised and/or invalid digital signatures, and network characteristics. Researchers leverage these similarities to rapidly and effectively triage file samples and extend malware detection rules.- Agent.XXA
- Conjar.B
- Emotet.EE
- Kryptik.VCHDA
- Kryptik.VCKAAH
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- Kryptik.YFB
- STOP.KOOM
- Stealer.EG
- Stop.PAAS Ransomware
- Ursnif.XB
Windows API Usage
Windows API Usage
This section lists Windows API calls that are used by the samples in this family. Windows API usage analysis is a valuable tool that can help identify malicious activity, such as keylogging, security privilege escalation, data encryption, data exfiltration, interference with antivirus software, and network request manipulation.| Category | API |
|---|---|
| Encryption Used |
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