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

Static analysis result for SHA-256 e3bd7149134025fe…

MALICIOUS

Office (OLE) / .XLS

204.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-04-04
MD5: d596c3558732c875163f5d537a5a579f SHA-1: 3398f48960e7d6ea02f98eeef80b83396e7a7920 SHA-256: e3bd7149134025febce4fb0f28eac6989ef484d01cb0ac2a75056f3a7c5fb8a0
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 PowerShell

The sample is an Excel file containing a malicious OLE object exploiting CVE-2017-11882 in the Equation Editor. This vulnerability allows for arbitrary code execution upon opening the document. No VBA macros were found to be executable, but the OLE object itself is the primary attack vector. The SHA256 hash is included as a primary IOC.

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
3c108ecf2354559012430de360c108ebbbbb0c2c2622039c880e58badb125e6d		 ole-package OLE Ole10Native stream: MBD0292B96B/olE10nAtiVE 1359 bytes

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