Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 9e58f0153e76552e…

MALICIOUS

Office (OLE) / .XLS

1.54 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-05
MD5: 7171235506fb2d85345d17b7ccafc859 SHA-1: 7b68af50033fbc86f3a9b4fdb4c1d521e514e6db SHA-256: 9e58f0153e76552e0f34934d63cb8cf3680e95a693d4ea3d35590b8de140dbc2
108 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The sample is an Excel file containing an embedded Equation Editor object, which is known to be exploited via CVE-2017-11882. The VBA macros are present but contain no executable statements, indicating the primary malicious functionality is within the OLE object. This exploit typically leads to the execution of a second-stage payload.

Heuristics 3

  • Equation Editor Ole10Native payload — CVE-2017-11882 critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    An embedded Microsoft Equation 3.0 object (CLSID 0002CE02-0000-0000-C000-000000000046) carries an Ole10Native packager stream instead of the normal Equation Native/MTEF data. This is the weaponized Equation Editor RCE delivery shape used by CVE-2017-11882 / CVE-2018-0802 maldocs. The payload (font-record overflow + shellcode) is frequently encrypted and the stream name case-scrambled to evade scanners, but an Equation object holding an Ole10Native stream has no benign use.
  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Contains Equation Editor object — related to CVE-2017-11882 / CVE-2018-0802 exploitation, but CLSID presence alone is not the malformed MTEF exploit primitive.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2412 bytes
ole10native_00.bin
9cbfc1e2f7c75c7ea93da794cbc093d1d0e7a538b3cc54a345709e92e6ee28e5		 ole-package OLE Ole10Native stream: MBD00B6D888/Ole10Native 1780 bytes

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