General
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Target
Yashma ransomware builder v1.2.exe
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Size
826KB
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Sample
241218-12zx5avlbj
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MD5
20a7eea3f65edd41df1e3bbce7d2b674
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SHA1
44a9d957a24ab0e9f2066e9dfc4da8f9d46f0025
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SHA256
e505fe2a77857ac94c657999533631289dc76a1c62c73169232dfcd7a25990a9
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SHA512
bf3189616f1ed3ca3059fdbb9ea72c38a2e32804b0c5919f058d0798b928c4fd1ce3d015a4366c3f689bcfaa10d2f1fcd3a169c9e3ec6a68f4abdc47ef386fb0
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SSDEEP
6144:pMPUfXnG2omFLhFLuFL6FL6aGMVFLQYFWD/:pL3GcQZ
Behavioral task
behavioral1
Sample
Yashma ransomware builder v1.2.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
Yashma ransomware builder v1.2.exe
Resource
win10v2004-20241007-en
Malware Config
Targets
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Target
Yashma ransomware builder v1.2.exe
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Size
826KB
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MD5
20a7eea3f65edd41df1e3bbce7d2b674
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SHA1
44a9d957a24ab0e9f2066e9dfc4da8f9d46f0025
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SHA256
e505fe2a77857ac94c657999533631289dc76a1c62c73169232dfcd7a25990a9
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SHA512
bf3189616f1ed3ca3059fdbb9ea72c38a2e32804b0c5919f058d0798b928c4fd1ce3d015a4366c3f689bcfaa10d2f1fcd3a169c9e3ec6a68f4abdc47ef386fb0
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SSDEEP
6144:pMPUfXnG2omFLhFLuFL6FL6aGMVFLQYFWD/:pL3GcQZ
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Chaos Ransomware
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Chaos family
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Renames multiple (217) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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Checks computer location settings
Looks up country code configured in the registry, likely geofence.
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Drops startup file
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Event Triggered Execution: Component Object Model Hijacking
Adversaries may establish persistence by executing malicious content triggered by hijacked references to Component Object Model (COM) objects.
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Executes dropped EXE
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Loads dropped DLL
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Modifies system executable filetype association
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Adds Run key to start application
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Checks installed software on the system
Looks up Uninstall key entries in the registry to enumerate software on the system.
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Drops desktop.ini file(s)
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Checks system information in the registry
System information is often read in order to detect sandboxing environments.
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MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Event Triggered Execution
2Change Default File Association
1Component Object Model Hijacking
1Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Event Triggered Execution
2Change Default File Association
1Component Object Model Hijacking
1Credential Access
Credentials from Password Stores
1Credentials from Web Browsers
1Unsecured Credentials
1Credentials In Files
1