RTF / .DOC malware analysis — malicious · 9d11da2a0336d5e8

MALICIOUS

RTF / .DOC

383.4 KB

MD5: 27c48efcef63e069fe9c37cd5a2c4c07 SHA-1: 8f63f8e73fa8e4c3f95d032e263f324a92864409 SHA-256: 9d11da2a0336d5e8a9791e0b87f98635fd8cb7c98db1749241df64386d02ea86

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. While no scripts were directly extracted, the presence of embedded OLE objects and the associated heuristics strongly imply a malicious payload delivery mechanism. The extracted embedded files are likely components of this payload.

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` `a5fb0b0b4ad4fb95a2de88e3010048d08a1c2151cedccaefea335e94493c0883`	rtf-objdata-decoded	RTF \objdata at offset 0x7DE	97369 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00031f9b.bin` `ad7bf1923f855fca5949d0c557a2a819b106cd84b204870bcc59064eb0c6e331`	rtf-objdata-decoded	RTF \objdata at offset 0x31F9B	2632 bytes
`objdata_02_off0003353e.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x3353E	12297 bytes

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