RTF / .DOC malware analysis — malicious · 4c8c2e00ff17a711

MALICIOUS

RTF / .DOC

383.7 KB

MD5: f7d09b7e0f892f51a105014ef42e364b SHA-1: 0733fa756ce44672a81a5a4383794239635a87e9 SHA-256: 4c8c2e00ff17a711b384fd504837894d7d8cf570433fb1b74935e0b6e2fb7d84

140 Risk Score

Malware Insights

MITRE ATT&CK

T1559.002 Component Object Model and Distributed Component Object Model 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 activation mechanisms. One of the extracted embedded artifacts, objdata_00_off000007d1.bin, is flagged as suspicious due to script execution terms. This points to a likely attack pattern involving the execution of malicious code embedded within the OLE objects.

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` `054d278ea70fef9d1ccd3aba486434576264dde5e356db5c2733764d735f33a7`	rtf-objdata-decoded	RTF \objdata at offset 0x7D1	97527 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off000320d6.bin` `ad7bf1923f855fca5949d0c557a2a819b106cd84b204870bcc59064eb0c6e331`	rtf-objdata-decoded	RTF \objdata at offset 0x320D6	2632 bytes
`objdata_02_off00033679.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x33679	12297 bytes

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