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

Static analysis result for SHA-256 b51ed7cb599ee973…

MALICIOUS

Office (OLE) / .XLS

243.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-06-09
MD5: 70d915431f8f8e7e4c5eb081259a0332 SHA-1: c274f82ca7e40670d6088d24586304c189ea794b SHA-256: b51ed7cb599ee973da39c6a09c0b1320db6500c86d8472292832538c7ec18922
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object that exploits CVE-2017-11882 in the Equation Editor. This vulnerability allows for arbitrary code execution when the object is processed. No VBA macros were found to be executable, but the presence of the vulnerable OLE object is sufficient 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
b8d111c053d037ae994d080d2669a7e660a0edd3779ad2a48b6b821967cf60c3		 ole-package OLE Ole10Native stream: MBD002807C6/ole10nAtIVE 1677 bytes

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