RTF / .DOC malware analysis — malicious · 42b8705f2ae3b4f7

MALICIOUS

RTF / .DOC

386.4 KB

MD5: 28a0aee786a3b78f6da47d56aaafe887 SHA-1: cef8566b3bf7a2df13a3f26672e772a8da96c05d SHA-256: 42b8705f2ae3b4f760192f99f0f6141ab7c6922680e491484e1daa8d6df5671f

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains multiple OLE objects, with specific heuristics indicating the use of ".objupdate" and Composite Monikers, suggesting an attempt to trigger OLE activation and execute embedded content. The presence of these OLE object-related heuristics strongly points towards an exploit delivery mechanism. No scripts were extracted, and the document body contained only formatting information, limiting further analysis of the specific lure.

Heuristics 5

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
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_off000007d1.bin` `8735767441c65b14499e4c81160aac5653b9c7c2a0cc80a894e27c9471cd29bd`	rtf-objdata-decoded	RTF \objdata at offset 0x7D1	98861 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00032bac.bin` `7a8598fff434e2b582d3d87e32bb1d356d28f288618d4b03cf39e56767823039`	rtf-objdata-decoded	RTF \objdata at offset 0x32BAC	2632 bytes
`objdata_02_off0003414f.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x3414F	12297 bytes

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