RTF malware analysis — malicious · d818089f782cbbc2

MALICIOUS

RTF

218.0 KB First seen: 2022-04-08

MD5: d1059e10fd56e5c15477b1fd04f6d54c SHA-1: d082f469a4c16a45089924a01164ac9edf03936f SHA-256: d818089f782cbbc21eaced97f1d08aa0759070ee2523c823d27cd292a4a1c6fa

123 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell

The RTF document contains multiple OLE objects, with heuristics indicating the use of ".objupdate" and Composite Monikers. This strongly suggests an attempt to exploit OLE object activation to execute embedded code. No document body text or scripts were extracted, limiting further analysis of the specific payload or lure. The attack pattern is inferred from the OLE object exploitation.

Heuristics 4

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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000007d0.bin` `0bed0c3ec9b775e5d755c655e625bf344599fa45bae864f997884641e92287dd`	rtf-objdata-decoded	RTF \objdata at offset 0x7D0	15933 bytes
`objdata_01_off000089e2.bin` `1721aab459b68b884f13b5caf8aed48f2f1a5eb3d65c1b2ddac08c7c93062de4`	rtf-objdata-decoded	RTF \objdata at offset 0x89E2	2632 bytes
`objdata_02_off00009f85.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x9F85	12297 bytes

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