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

Static analysis result for SHA-256 10cd2aa23f0117fb…

MALICIOUS

Office (OLE) / .XLS

750.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-22
MD5: 16b925b3b891d0ba91552419b6c9a343 SHA-1: 44c430319377079043ec265b83963f7dec1a3a9a SHA-256: 10cd2aa23f0117fb286aba9f6a6ecbf7c467071881763d18c570574eed5b3dc8
108 Risk Score

Malware Insights

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

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within an Equation Editor OLE object. While the VBA macros themselves contain no executable statements, the embedded OLE object is the primary indicator of compromise. This exploit is commonly used to deliver secondary payloads, making this a likely initial access vector.

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
1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2412 bytes
ole10native_00.bin
9dcdabe0e1188caa5304950b4e9a2f9be954b9df5ef5931059b97943019420e5		 ole-package OLE Ole10Native stream: MBD01E9374D/Ole10Native 1967 bytes

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