RTF / .DOC malware analysis — malicious · cb836996444ea64c

MALICIOUS

RTF / .DOC

383.4 KB

MD5: 5df14cb789ee01b67735ba23305de747 SHA-1: 5a4625123ef72011c598811b56c29879aebc38af SHA-256: cb836996444ea64cbbc74d40ae7a98f45a0ba279176f9b453ab7bcf62a144ded

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains multiple embedded 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 artifacts, objdata_00_off000007de.bin, is flagged as suspicious due to script execution terms. This indicates the document is likely designed to trick the user into activating the OLE object, which then executes malicious code, potentially leading to further compromise.

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` `f25b9b7ad4988bfaee763db105b79008f68fdcad569b443036907a883e85cd82`	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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