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

Static analysis result for SHA-256 5e7922b838a9a8ed…

MALICIOUS

Office (OLE) / .XLS

1.03 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-23
MD5: 6fbba09eebd42a47f089767b92b9c778 SHA-1: 1af588c699ab643e334824dc26cf9baf4ddca8d5 SHA-256: 5e7922b838a9a8edc76bb6629c189c55125e40fc812f4b57bfad3e37feb68d86
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded Equation Editor OLE object, which is a known vector for exploiting the CVE-2017-11882 vulnerability. The heuristic firings directly indicate the presence of this exploit. While no VBA code was found to be executable, the OLE object itself is the primary indicator of compromise, likely serving to download and execute a second-stage payload.

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
b5c1cd9dd10d9d244a7029e89bd7fb33173a575e235ac00812168ece8ce563f3		 ole-package OLE Ole10Native stream: MBD0284BED9/olE10natiVe 1476 bytes

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