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

Static analysis result for SHA-256 aa24a9548516c4c2…

MALICIOUS

Office (OLE) / .XLS

1.03 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-29
MD5: edeea73d088bb965e5bf0745634f14d5 SHA-1: 1f664c663a6f8f39b26d0f542d8f0404b962a8d0 SHA-256: aa24a9548516c4c2666d6b69be45821d0d0ec81e7da233af421f6d42fbf01797
108 Risk Score

Malware Insights

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

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in the Equation Editor component. The presence of VBA macros, though not containing executable statements directly, suggests a potential for further stages or obfuscation. The file's purpose is to leverage this vulnerability to execute a 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
ed8da65f0f0a4cc2a905cfcf1ae916bf05ced375ebeefae9a837c8bf84ad6699		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3618 bytes
ole10native_00.bin
c881b3ab9e8ecdd64908881b3fd072094ea6595275e3451aca9d710010c5632a		 ole-package OLE Ole10Native stream: MBD011E2D30/oLE10NATiVe 1753 bytes

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