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

Static analysis result for SHA-256 4b1884d816c4abd7…

MALICIOUS

Office (OLE) / .XLSX

169.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-06-16
MD5: 365b0eeb5b5a210daa6188d3040ac071 SHA-1: 5dd4f74e1f1c15555802cac754e3116d4c5304ac SHA-256: 4b1884d816c4abd76b64c4242121321a82fc123dab8f17dac0a303a933c38daa
148 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample contains an embedded Equation Editor OLE object that is known to be vulnerable to CVE-2017-11882. This vulnerability allows for arbitrary code execution when the object is processed. The VBA project itself does not contain executable statements, indicating the exploit payload is likely within the OLE object.

Heuristics 4

  • 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.
  • x86 GetPC stub (CALL $+5; POP EAX) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EAX)
  • 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
2c0cb38b70d0469ba3590c978e6e035e609d501e95b600d9175022d24c328aaf		 ole-package OLE Ole10Native stream: MBD00350139/OlE10nAtiVE 1619 bytes

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