RTF / .DOC malware analysis — malicious · 32891022397f72d2

MALICIOUS

RTF / .DOC

218.2 KB First seen: 2022-02-15

MD5: 5f9fe1dbc14e3e1dbbafc7d7eaefa9ad SHA-1: c113699c00cb4439a6e447a44f47b8d6b18a043f SHA-256: 32891022397f72d288c5949a023d9ecd514450d8116e9138dc03ea40533ae348

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.005 Visual Basic

The RTF document contains multiple OLE objects, with specific heuristics indicating the use of composite monikers and objupdate directives to force OLE activation. The document body explicitly prompts the user to 'Enable Editing', a common lure for macro-based malware delivery. While no scripts were directly extracted, the presence of embedded OLE objects and the lure strongly suggest an attempt to execute malicious code upon user interaction.

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_off00000ba2.bin` `a96c417b56f55f2b0ba4ced285da6a6709c217d49430fd9f952fe65c7e48ffbe`	rtf-objdata-decoded	RTF \objdata at offset 0xBA2	15570 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00008ac2.bin` `893d8db8585190a273d0c7c3dcff2eb58184b866a3687a9319ca72a8284876cb`	rtf-objdata-decoded	RTF \objdata at offset 0x8AC2	2632 bytes
`objdata_02_off0000a065.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0xA065	12297 bytes

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