RTF / .DOC malware analysis — malicious · ac87fc5457cd7299

MALICIOUS

RTF / .DOC

383.4 KB

MD5: 29c859a887ee243e832aa77c595025cb SHA-1: 47da9158ff7db13ab66994182ef824244d17b21f SHA-256: ac87fc5457cd7299a3df5105d2acb586680a6e9771c9febb5f27434f8bad5d9d

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 attempt to exploit OLE object activation for code execution. The embedded artifact objdata_00_off000007de.bin was flagged as suspicious, likely containing the payload. The SHA256 hash of the analyzed file is provided as a primary IOC.

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` `2db654cb6c4e98bcb10aad53e3d8eeca068169e646092a2cd5b9d30cb06ab0b2`	rtf-objdata-decoded	RTF \objdata at offset 0x7DE	97384 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00031fb9.bin` `ad7bf1923f855fca5949d0c557a2a819b106cd84b204870bcc59064eb0c6e331`	rtf-objdata-decoded	RTF \objdata at offset 0x31FB9	2632 bytes
`objdata_02_off0003355c.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x3355C	12297 bytes

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