Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0 — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 605d0e039329389b…

MALICIOUS

Office (OOXML) / .XLSX

809.8 KB Created: 2022-05-16 17:34:45 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-11-03
MD5: 6f2ddbf59b5e47b26d13bb18554c9cbc SHA-1: b311e08803741f74d2432189d3de16fb4d68ddc1 SHA-256: 605d0e039329389b5e8e1fbed3d5bbeb6d26bca9500764ead20e60feef831add
160 Risk Score

Malware Insights

Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0 · confidence 95%

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is identified as malicious by ClamAV with the signature Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0. High-severity heuristics indicate the presence of an embedded Equation Editor OLE object that carries a payload-like Ole10Native stream. This suggests the document is designed to exploit vulnerabilities or deliver a secondary payload through this embedded object.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/pSKTu.OGqybX contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • ClamAV: Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
a79935d0f1768b9212998cf84328bda58d6ee17a38df2874163b7a3d5a80acd7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/pSKTu.OGqybX 995840 bytes
ooxml_oleobject_00_ole10native_00.bin
e28aa57ea8e8685bceb334ff6880a552076b35e10168a1d455024cc8219060f0		 ole-package OOXML xl/embeddings/pSKTu.OGqybX Ole10Native stream: Ole10nATIvE 985116 bytes
emf_00.emf
38f17a599ac5d645df3840bbb401710ef81573a747da20abbfc1b7d9a9273b58		 ooxml-emf OOXML EMF part: xl/media/image1.emf 169096 bytes

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