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

Static analysis result for SHA-256 d53bfebaa5727190…

MALICIOUS

Office (OLE) / .XLS

287.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-20
MD5: 8654f45ca86d45b40eda29324478b986 SHA-1: 5b48b95f25c0f2f091ecba6cefbce7dd93301e6e SHA-256: d53bfebaa5727190790fb0ee11028d82703c9ec84e50735248179a756ed0fd04
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 Visual Basic

The file is a Microsoft Excel spreadsheet containing an embedded Equation Editor object. Static analysis identified a critical heuristic indicating the presence of a payload exploiting CVE-2017-11882 within this object. Although the VBA project itself contains no executable statements, the OLE object is the primary vector for exploitation, likely leading 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
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
0bd1a7c6c4f961d38c26f81bfa637570202930e938ae42787b083a97687bdcf0		 ole-package OLE Ole10Native stream: MBD00408A6C/OLE10naTive 1508 bytes

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