Xls.Malware.Valyria-10036093-0 RTF malware analysis — malicious · 3e866d1c73e4c940

MALICIOUS

RTF

691.4 KB Created: 2018-05-21 23:04:00 First seen: 2021-02-23

MD5: 10280bab51f69d78610b7cd524afaa6e SHA-1: 7ee09983b86b9fc19d05d24d986f2b8963b5ebf8 SHA-256: 3e866d1c73e4c9403ab35f0946ab271199d89b7f1788ab61bd31fe70a9def25a

202 Risk Score

Malware Insights

Xls.Malware.Valyria-10036093-0 · confidence 95%

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains multiple embedded OLE objects, with one being forcefully updated via \objupdate. ClamAV detections, specifically 'Xls.Malware.Valyria-10036093-0', strongly indicate malicious content within these embedded objects. The presence of OLE objects and the forced update suggest an attempt to execute malicious code upon opening the document.

Heuristics 5

ClamAV: Doc.Dropper.Agent-6412232-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6412232-1
\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 10 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000065ce.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x65CE	21051 bytes
SHA-256: `add3155c68f596a205cbd0723ab430462db49971b5085c0dd0ad28817c5343ae`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_01_off00016422.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x16422	21051 bytes
SHA-256: `eaa012d3d2dc5f27f1f40613ed72b9f14eeca79c2025b99827620708f945c322`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_05_off00055dc4.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x55DC4	21051 bytes
SHA-256: `20655983a868bd0d1456bc5f554c8c898657d891afb0382b5ae58badb4cffe59`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely

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