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

Static analysis result for SHA-256 3cac6bf80d8e08ae…

MALICIOUS

Office (OLE) / .XLS

394.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-10
MD5: f86352ecf072ab7a988d00a31eb7b39a SHA-1: c9023600bf1f0bc7f980f672fcca1a08213a593c SHA-256: 3cac6bf80d8e08ae06f1c6d100732b88b6d2e4bdef84299eed960194423fd64d
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates that this file exploits a known vulnerability in Microsoft Equation Editor. The OLE object containing the exploit payload is embedded within the Excel file. No VBA macros were found to contain executable statements, suggesting the primary execution vector is the Equation Editor vulnerability.

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
43bf2637cd10daad1828f2dc5e728cb3ea2b0db3fad96d0055f9cfcb0d0ec167		 ole-package OLE Ole10Native stream: MBD00118210/OlE10NATivE 1761 bytes

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