RTF / .DOC malware analysis — malicious · fd6fa9797ce79d19

MALICIOUS

RTF / .DOC

218.0 KB First seen: 2022-04-18

MD5: b555038bcca2b0cfb767d65e8c6be678 SHA-1: be322cbd0a5264d3bb3a90ac2af3dffc209e1f46 SHA-256: fd6fa9797ce79d199aca7e266a7c6cc1c04a9e85b2276e66cfc5d20e10cdd08f

160 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The RTF document contains embedded OLE objects and triggers ".objupdate" which forces OLE activation, indicating it's designed to execute embedded content. The document body explicitly instructs the user to 'click Enable Editing', a common lure for macro-enabled malware. The presence of multiple embedded binary artifacts suggests a multi-stage payload delivery. No scripts were extracted, limiting further analysis of the payload's specific actions.

Heuristics 6

Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED

RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
\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.
OLE object data medium RTF_OBJDATA

RTF contains 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
Suspicious extracted artifact medium 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000095d.bin` `b1a9f95a5d95f0e1506611f62ac003e9aaaff6ab29354f0a15d968f450221f07`	rtf-objdata-decoded	RTF \objdata at offset 0x95D	15749 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off000089f1.bin` `7b74a822cc160a0a46dc6db6fcbc7a2291eea6fdb58fa98ed0d9b3907cb827e4`	rtf-objdata-decoded	RTF \objdata at offset 0x89F1	2632 bytes
`objdata_02_off00009f94.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x9F94	12297 bytes

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