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

Static analysis result for SHA-256 784ee1cd9ed51518…

MALICIOUS

Office (OOXML) / .XLSX

855.7 KB Created: 2022-05-16 17:34:45 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-07-07
MD5: 9a390613d477d83c7e48bb8e94ddeb96 SHA-1: 42bc7f75827deac0414b95680c83840501d96ef3 SHA-256: 784ee1cd9ed51518224075fb3e564d689f5a98157fc1fdeff17ee090fa5c4be2
160 Risk Score

Malware Insights

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

MITRE ATT&CK
T1204 Malicious File T1059 Command and Scripting Interpreter

The file is identified as malicious by ClamAV as 'Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0'. High-severity heuristics indicate the presence of an Equation Editor OLE object that carries a payload-like stream, suggesting it's designed to execute malicious code. The embedded OLE object and its anomalous Ole10Native stream are key indicators of a downloader or dropper functionality.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/1XCH.2VBn 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
9fc5be26eba78df792e4f8f57d6496ab92b0c11bd7845987d6697555a0c9d61b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/1XCH.2VBn 1069568 bytes
ooxml_oleobject_00_ole10native_00.bin
577f30e3cc8afcddb02c00cca2f3b6c4fe6f6038224ab513414d19c079313bbe		 ole-package OOXML xl/embeddings/1XCH.2VBn Ole10Native stream: oLE10nAtivE 1058486 bytes
emf_00.emf
38f17a599ac5d645df3840bbb401710ef81573a747da20abbfc1b7d9a9273b58		 ooxml-emf OOXML EMF part: xl/media/image1.emf 169096 bytes

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