Xls.Malware.Valyria-6934880-0 RTF malware analysis — malicious · fe2eb895f13534b1

MALICIOUS

RTF

737.1 KB Created: 2018-02-07 20:59:00 First seen: 2021-02-23

MD5: 306bed698ed9a2b33c376c4668dcb774 SHA-1: 754e53e33f2745bc86b98a27bdb837d083356780 SHA-256: fe2eb895f13534b1380c37f467e31b4f5ee42d092442924b5baac6b03325549e

202 Risk Score

Malware Insights

Xls.Malware.Valyria-6934880-0 · confidence 95%

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains multiple embedded OLE objects, with heuristics indicating that \objupdate forces OLE activation. ClamAV detections identify the embedded content as 'Xls.Malware.Valyria-6934880-0', suggesting it's designed to exploit vulnerabilities or deliver a malicious payload. The presence of embedded OLE objects and the ClamAV detection strongly indicate a malicious intent, likely involving exploitation for client execution.

Heuristics 5

ClamAV: Xls.Malware.Valyria-6934880-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Valyria-6934880-0
\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 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002c2a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2C2A	22587 bytes
SHA-256: `2a8d9c85b678ed47680ff2c4435258d8fc206d5cd19905af8260558f4781068b`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_01_off00013836.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x13836	22587 bytes
SHA-256: `1d2bd306ec41443b4b81fc07cf2f756459306e46624f9fdc7f6a6dec817d8dbb`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_02_off000243b7.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x243B7	22587 bytes
SHA-256: `a8f52339d3d33ef6f8f4abf2785bbc1f378c95984c30161bda4d14ccd5fccf01`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_03_off00034f3a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x34F3A	22587 bytes
SHA-256: `06ae281740a088ace231a440dd20a8a419c5f845e939c6f85abbba1d9e260727`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_04_off00045abd.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x45ABD	22587 bytes
SHA-256: `7fed26c2506522d28add82b44e8c56add72c99b0cb7203b3c8b3aa1147195fd4`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_05_off00056640.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x56640	22587 bytes
SHA-256: `824f28a3baad0dc727c4809640b4bf2e217cca879bff875d04cdae57b5fbbdee`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_06_off000671c3.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x671C3	22587 bytes
SHA-256: `8c614f1b5b2101a968d1ad260c1f1ad404723c285e4f16cdad338faf76a8ce5a`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_07_off00077d46.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x77D46	22587 bytes
SHA-256: `6c8edba4164485dfb6d2014c5d201a15e1ef9f1ec1433d33a1622dffa335bc8e`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_08_off000888c9.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x888C9	22587 bytes
SHA-256: `2e203a9aebf5097f4ebd1918f4a83e1863a23259991128eb0a6fa08c27a524a5`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_09_off0009944c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x9944C	22587 bytes
SHA-256: `19a54e01937797bddc1b84cf2bd192c4ee517ca89ed320f137ad409a072f1261`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely

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