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

Static analysis result for SHA-256 a5fafe29b2e872eb…

MALICIOUS

Office (OLE) / .XLS

1.03 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-28
MD5: 65ec993d799cd0651db5240a3e93dac4 SHA-1: a70b4d08f1b98fe556b86e69302ae90f4c8b947a SHA-256: a5fafe29b2e872eb9fd5cf545fdfee17b1d0f636e5d0db0227c5116b9c5a1868
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample contains an embedded Equation Editor OLE object that exploits CVE-2017-11882. This vulnerability allows for remote code execution when the document is opened. No VBA macros were found to be executable, and the document body was not parsable. The primary attack vector is the exploitation of the Equation Editor vulnerability.

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
efddf604b0ac890a0a75ac986c3d1eb23e48c497276f6e81cec1ab56d06cf828		 ole-package OLE Ole10Native stream: MBD0107142F/olE10NAtIVe 1656 bytes

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