RTF malware analysis — malicious · 1447275b4b89a6c2

MALICIOUS

RTF

197.4 KB Created: 2019-01-07 23:54:00 First seen: 2020-02-04

MD5: 93aebe40f58d77db7c441cf8b6a29fe4 SHA-1: d9f9134a1592795dc9f07e06ed2bc29a977d5716 SHA-256: 1447275b4b89a6c2e131cd9049ba7a36a2a91ce52dffb952cd8b1ad63019ac0a

162 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple OLE objects, with specific heuristics indicating that \objupdate forces OLE activation and that the object class is a package. This suggests an attempt to exploit OLE object handling to execute embedded code. The presence of extracted artifacts like 'objdata_00_off000024ac.bin' further supports this, as it signals a suspicious extracted artifact with VBA auto-execution terms. The likely attack pattern is exploitation for client execution, delivered via a spearphishing attachment.

Heuristics 6

\objupdate forces OLE activation high RTF_OBJUPDATE

RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
Package object class high RTF_OBJCLASS_PACKAGE

OLE Package object — can wrap arbitrary files
Suspicious extracted artifact high 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.
OLE object data medium RTF_OBJDATA

RTF contains 2 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.cmu.ed In RTF body
- http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body
- http://www.cmu.edu/blackboardIn RTF body
- http://www.cmu.edu/blackboard/evaluate#manage_tests/import_questionscIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000024ac.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x24AC	74286 bytes
SHA-256: `08c2d20208b06701f37ed290b7de1614551af0bd997e5b408f41063fe36a22cc`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_01_off000273ec.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x273EC	6502 bytes
SHA-256: `4d78aaeea748a71dcb0130caf1f2c86d1f67ede8256319ad5cd481b642f10cad`

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