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

Static analysis result for SHA-256 5aa47f37d752f2be…

MALICIOUS

Office (OLE) / .XLS

838.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-28
MD5: f9fd49f28204d58fe67ec08c7e8a0815 SHA-1: 2c7d6590f7a2c6f3e545b4ef8e107416728c2bf5 SHA-256: 5aa47f37d752f2be0e81960995899ad5a4a42cba75b045c2232942524ef6c9f6
108 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. This suggests the file is designed to deliver a secondary payload by leveraging this exploit. No VBA macros were found to contain executable statements, and no document body was available for analysis.

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
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
0885b29f673b9033efbb01ccb029eb95e4e048b1c024ad35d2364b3419de20e0		 ole-package OLE Ole10Native stream: MBD01AD5C35/OLE10NATivE 1352 bytes

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