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

Static analysis result for SHA-256 9d6fcf6155af47fb…

MALICIOUS

Office (OLE) / .XLS

569.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-16
MD5: 8caa05af7060f02bab07ccfba6ac42d6 SHA-1: 76c26e775a07e6e4c08be329e8062a901cff4d76 SHA-256: 9d6fcf6155af47fbacddd1f7feb457dc919f1ee29f3d28cc30f3c9c437ee516a
108 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File T1059.005 Visual Basic

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within an Equation Editor OLE object. Although the VBA macros themselves contain no executable statements, the embedded OLE object is the primary vector for exploitation. This suggests the file is designed to deliver a secondary payload upon opening.

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
b36351663c5801e18900edb399ca02cb568c302387836a59fb984f2c3ffa89a2		 ole-package OLE Ole10Native stream: MBD002D6EDE/Ole10nAtIvE 1852 bytes

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