RTF malware analysis — malicious · a0eb54a9aa2ff0e8

MALICIOUS

RTF

217.6 KB First seen: 2022-04-18

MD5: db8df31b3990dd90bf7925e63b851f93 SHA-1: 24ec6316b57f73b82343f6b1940f4136e57dd67f SHA-256: a0eb54a9aa2ff0e8af57bdac12413510de56be53b84bfbd00ceb043e9809e03b

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1027 Obfuscated Files or Information

The RTF file contains multiple OLE objects, with heuristics indicating the use of \objdata and \objupdate, strongly suggesting an attempt to exploit OLE activation mechanisms. The presence of embedded OLE objects, specifically objdata_00_off000007d2.bin, points towards a malicious payload delivery. The file's structure and heuristic firings align with techniques used to deliver secondary payloads via embedded objects within documents.

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_off000007d2.bin` `e277717b8544388dc347516704ba98dfd1e19145c2ded431fbd652f2bf5b2f2a`	rtf-objdata-decoded	RTF \objdata at offset 0x7D2	15757 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00008876.bin` `7b74a822cc160a0a46dc6db6fcbc7a2291eea6fdb58fa98ed0d9b3907cb827e4`	rtf-objdata-decoded	RTF \objdata at offset 0x8876	2632 bytes
`objdata_02_off00009e19.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x9E19	12297 bytes

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