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

Static analysis result for SHA-256 c7fd4c593fc6ccf3…

MALICIOUS

Office (OLE) / .XLS

804.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2026-03-09
MD5: 5a0d2ade080d20632ddedc3e7e6d99cf SHA-1: 7463651129f72cae9f33ec9ec0d043e31c72a2c5 SHA-256: c7fd4c593fc6ccf31d39aee0d13cb287fbeb1c2a5917fb756e5fda0134da12fb
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1059.005 Visual Basic

The file is an Excel spreadsheet containing an embedded Equation Editor OLE object. Static analysis identified a critical vulnerability in this object, specifically CVE-2017-11882, which is known to be exploited for arbitrary code execution. Although the VBA project contains no executable statements, the presence of the vulnerable OLE object indicates the primary attack vector. The file is therefore likely used to exploit this vulnerability to deliver a secondary 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
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
db911dd9441b623234beb881588ae633546f836e3c51a214b0a8a2c3150f7872		 ole-package OLE Ole10Native stream: MBD005B9B38/Ole10NAtIvE 1701 bytes

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