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

Static analysis result for SHA-256 cbb0357059e10cf6…

MALICIOUS

Office (OLE) / .XLS

535.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-08
MD5: 709da06b5a1b7f27a33dcd2706b5e8a3 SHA-1: 474a026d4cb2b4480cac500df652fd78e40b4b75 SHA-256: cbb0357059e10cf641fcc108f5638b4b07bb0c8098527b04ec8c3e0aae9bd929
108 Risk Score

Malware Insights

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

The critical heuristic firing for CVE-2017-11882 indicates the exploitation of a vulnerability within the Equation Editor OLE object. This exploit is known to be used for delivering arbitrary code execution, often leading to the download and execution of further malicious payloads. No VBA macros were found to be executable, suggesting the primary malicious functionality resides within the embedded OLE object.

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
c0bb83db4fcfb79e0debcecece0446451c14a14892185d8c19abc7d5ce022e97		 ole-package OLE Ole10Native stream: MBD017876B5/ole10NatIVe 1354 bytes

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