Xls.Malware.Valyria-10036093-0 RTF / .DOC malware analysis — malicious · 0c71bb401046b216

MALICIOUS

RTF / .DOC

735.0 KB Created: 2021-03-31 09:58:00

MD5: 995d8da92fc74b6aee1521f527fee8b1 SHA-1: f56d89e8d74b4d29a2633de96cf6ec8e4123207e SHA-256: 0c71bb401046b21691ed7d96c1d6a050233a5783aa77ef95a359270db88d22a2

202 Risk Score

Malware Insights

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

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple OLE objects, with the \objupdate heuristic indicating an attempt to force OLE activation. ClamAV detections confirm the presence of the Valyria malware family. This suggests the file is designed to exploit OLE vulnerabilities to deliver a malicious payload, likely via a spearphishing attachment.

Heuristics 6

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

ClamAV detected this file as malware: Xls.Malware.Valyria-10036093-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
\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 8 \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

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00018a14.bin` `b6499e76f4794ba2c79bc1d8701fa52b20298cb202049dcaf2925f9600708cc8`	rtf-objdata-decoded	RTF \objdata at offset 0x18A14	28219 bytes
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely
`objdata_01_off0002bd65.bin` `6f7b7f1f1d804d7b7a9a994dd2663c4e3b773257c2ecc85242e85418e73a9589`	rtf-objdata-decoded	RTF \objdata at offset 0x2BD65	28219 bytes
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely
`objdata_02_off0003f0b6.bin` `6b163e1fbbb1cba8a752ef70ef01bbc3340b924bab0c629b47c155c619192d1e`	rtf-objdata-decoded	RTF \objdata at offset 0x3F0B6	28219 bytes
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely
`objdata_03_off0005250e.bin` `f07243ea8b8688d6b9f1cd866ec2216e0dcdfc63934e90f7bed6d2a3ac0305db`	rtf-objdata-decoded	RTF \objdata at offset 0x5250E	28219 bytes
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely
`objdata_04_off000659b4.bin` `560c8a4fdd4fa96f02bbf6f49b4b53aaf32531c49e1dbaa4be595aed7242d3ea`	rtf-objdata-decoded	RTF \objdata at offset 0x659B4	28219 bytes
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely
`objdata_05_off00078e0e.bin` `d95a26474151cd2dff6278639b23a7d7429b8e9094573309addac6ae66b49453`	rtf-objdata-decoded	RTF \objdata at offset 0x78E0E	28219 bytes
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely
`objdata_06_off0008c33b.bin` `455c6e7b89d90929915699400809926de9cf9e83a228f1ac5a4688c106d616b5`	rtf-objdata-decoded	RTF \objdata at offset 0x8C33B	28219 bytes
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely

Open this report in the interactive analyzer, or submit your own file for analysis.