Malicious RTF — malware analysis report

Static analysis result for SHA-256 4a1f4cfde5fa1b40…

MALICIOUS

RTF

508.0 KB Authoring application: Msftedit 5.41.15.1515 First seen: 2015-09-30
MD5: 8be9f18afd5f69c0cf43d276f99b8be3 SHA-1: 0e6a47e73dd6cc43c9ff154f3603e1242a71a4a5 SHA-256: 4a1f4cfde5fa1b400188d771a2f4380430ab06a3877c8126a543cb62208e8b3e
262 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data, specifically a package object, which is a strong indicator of malicious intent. ClamAV detections confirm this, identifying the file as Win.Trojan.VB-1226. The document body provides a lure, suggesting the embedded object contains sensitive information like a 'password hotmail', likely to entice the user to execute it. The embedded artifact 'objdata_00_off00000124.bin' is the primary IOC.

Heuristics 6

  • ClamAV: Win.Trojan.VB-1226 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.VB-1226
  • PE header (with DOS stub) in hex data critical RTF_MZ_HEX
    Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
  • Package object class high RTF_OBJCLASS_PACKAGE
    OLE Package object — can wrap arbitrary files
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000124.bin rtf-objdata-decoded RTF \objdata at offset 0x124 249661 bytes
SHA-256: 0512cdbd59036f8be2beb6b30d75b782d7dcb515f724e347392519a8f32458c2
Detection
ClamAV: Win.Trojan.VB-1226
Obfuscation or payload: likely
Carved artifact entropy is 7.70, consistent with packed or encrypted content.