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

Static analysis result for SHA-256 426488ff2af183aa…

MALICIOUS

Office (OLE) / .XLS

560.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-11
MD5: 7efec956e45e3782cd7cb9c7255e2efc SHA-1: 9f17b9a7af94b777cbfb57d33e992d2a9b3723c4 SHA-256: 426488ff2af183aa55acf2274f18d9ce0a206cbccad2800512c0d0a3b90087af
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE-2017-11882 indicates the exploitation of a vulnerability within the Equation Editor OLE object. This technique is commonly used to achieve arbitrary code execution. No VBA macros were found to contain executable statements, suggesting the exploit is directly embedded within the 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 3

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
fff4ecc77e83b0a934d239b734fd03d9d4aa553e16bff145dfc8c37ea78f9848		 ole-package OLE Ole10Native stream: MBD004D5EF5/Ole10Native 167172 bytes
ole10native_01.bin
4875527e78301959daf1f91c7eb95c0aed2dae9dc7ee924409184b700a883b07		 ole-package OLE Ole10Native stream: MBD004D5EF7/oLe10nAtive 1468 bytes

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