Xls.Malware.Valyria-10036093-0 RTF malware analysis — malicious · 0a24e1fd1ce1c7fa

MALICIOUS

RTF

473.8 KB Created: 2021-06-18 First seen: 2021-06-28

MD5: 33bf87b412521b571b9297a14bf57ee8 SHA-1: 4c9ea9cf3b875c435a2accbad18a20f16137ac26 SHA-256: 0a24e1fd1ce1c7fab006e461374e314015332e276f6d526d927942f987e93bb9

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: Xls.Malware.Valyria-10036093-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Valyria-10036093-0
\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 6 \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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000290f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x290F	26683 bytes
SHA-256: `d48ff5b798a03f6a7da516ad6ab7008518eab0611ccd7c7474c46f879b8d8548`
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely
`objdata_01_off00015046.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x15046	26683 bytes
SHA-256: `fd8fe3d93fe3bd482d9f11bce3ca0cf37332ff963cba428fbb19cb7e5519b980`
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely
`objdata_02_off0002777b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2777B	26683 bytes
SHA-256: `c31f60b5389a993ffdef9babf85c75c05783c28d3c1f70f8885d6692f01d8b0f`
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely
`objdata_03_off00039eb0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x39EB0	26683 bytes
SHA-256: `63077bd30ff0ab356b91d1d17a30454144b3409369a451b4a422d2ef7a74b01d`
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely
`objdata_04_off0004c6ec.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x4C6EC	26683 bytes
SHA-256: `0cab7b1e1e3b74374f6c3d03a27e9b29e78f65146182e2ed775b2f9585efaab0`
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely
`objdata_05_off0005ef28.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x5EF28	26683 bytes
SHA-256: `b8413c7b81bd6ff2d927fe592f162c02ac79784efeac843d786198add086a15a`
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely

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