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

Static analysis result for SHA-256 886e66478080728e…

MALICIOUS

Office (OLE) / .XLS

1.10 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-24
MD5: 4a67540089bc33099f847ce8e5d22211 SHA-1: 2014c6bb21cd1f3d6d59c829ef10f8f0f0173268 SHA-256: 886e66478080728e1043e5bd0d1c6663180ff70b311db453ca5de77608ee63f6
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded Equation Editor object. Critical heuristics indicate the exploitation of CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution when the object is processed. No VBA macros were found to be executable, and no document body was extracted, but the presence of the vulnerable OLE object is sufficient evidence for exploitation.

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
6f6a2a405f4a0c4651b33aa3a1b3247c27f529d5afae709b1053a61bad9c84c4		 ole-package OLE Ole10Native stream: MBD008701DD/Ole10NAtIvE 2177 bytes

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