RTF / .DOC malware analysis — malicious · b089a10e4021402f

MALICIOUS

RTF / .DOC

383.4 KB

MD5: 5a05c8b95363756eff88e6d3b4092a3a SHA-1: db3619e6c410374c5260ab5c0af9618aec36efa8 SHA-256: b089a10e4021402f3754065f81cdcbf723efe85e1782b1b811ed39959593207f

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, strongly suggesting an exploit targeting OLE object activation. One of the extracted embedded files, objdata_00_off000007de.bin, is flagged as a suspicious artifact likely containing script execution terms. This indicates the document is designed to lure the user into activating the OLE object, which then executes malicious code, likely for further payload delivery.

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_off000007de.bin` `68e040936725f8a808c935bdaee64034e20049b2930dd894cf33673154fa58fc`	rtf-objdata-decoded	RTF \objdata at offset 0x7DE	97365 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00031f91.bin` `ad7bf1923f855fca5949d0c557a2a819b106cd84b204870bcc59064eb0c6e331`	rtf-objdata-decoded	RTF \objdata at offset 0x31F91	2632 bytes
`objdata_02_off00033534.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x33534	12297 bytes

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