Xls.Malware.Valyria-10036093-0 RTF / .DOC malware analysis — malicious · 44609be274ceb47b

MALICIOUS

RTF / .DOC

754.9 KB Created: 2021-03-26 01:48:00

MD5: abebd0ed6fd6c71bf1593efc5eb3312f SHA-1: c42533786aeda835eb77ecdb7eb8aaa0bceb0b85 SHA-256: 44609be274ceb47badbb35cb9b9bd861a2ca4a0aec9c8348fbabac39816ed73f

200 Risk Score

Malware Insights

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

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1137.003 DLL Side-Loading

The RTF document contains multiple OLE object data sections and uses \objupdate to force OLE activation, indicating an attempt to exploit embedded objects. ClamAV detections confirm this file is malicious, specifically identifying it as Xls.Malware.Valyria-10036093-0. The presence of OLE objects and the ClamAV signature strongly suggest a malicious payload is being delivered and executed.

Heuristics 5

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

Extracted artifacts 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0001981f.bin` `336cc5e3eb99e38439bc40dd2f911d26068fe3b0de10d16a76b4dca907ec7752`	rtf-objdata-decoded	RTF \objdata at offset 0x1981F	29243 bytes
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely
`objdata_01_off0002d392.bin` `e08171bd0f79b7f6a88fdcc5cfd6db6439c032187a3c1bef094d5b98e5192b3c`	rtf-objdata-decoded	RTF \objdata at offset 0x2D392	29243 bytes
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely
`objdata_02_off00040f05.bin` `3ff68b64d0ce0ba621587381737e647b5e69080950f29c135a23582e8bed1fab`	rtf-objdata-decoded	RTF \objdata at offset 0x40F05	29243 bytes
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely
`objdata_03_off00054b7f.bin` `4ce5138fef18283d3ee4fae093d9084bee55338d1f77096b3ab7a8b071c73015`	rtf-objdata-decoded	RTF \objdata at offset 0x54B7F	29243 bytes
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely
`objdata_04_off000688d1.bin` `b90baf7dfc77b405a699c9f13095fb35c873193ae5c07a5e149f28300275f426`	rtf-objdata-decoded	RTF \objdata at offset 0x688D1	29243 bytes
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely
`objdata_05_off0007c54e.bin` `bebe7a6fa5234813f3bef9b7908503473ca7e7db36b73564e46c22b7b15858d5`	rtf-objdata-decoded	RTF \objdata at offset 0x7C54E	29243 bytes
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely
`objdata_06_off0009029c.bin` `7e77fa27846f6d39ce90829b7e15851c235314eaccf75a7374645e19dcb3f0ee`	rtf-objdata-decoded	RTF \objdata at offset 0x9029C	29243 bytes
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely
`objdata_07_off000a3f13.bin` `81a0133b82a608e931f892d6c28c93868ea7d181f3b8dfde8f7bf9efc09b889e`	rtf-objdata-decoded	RTF \objdata at offset 0xA3F13	29243 bytes
Detection ClamAV: Xls.Malware.Valyria-10036093-0 Obfuscation or payload: unlikely

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