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

Static analysis result for SHA-256 eeab5dc8c68422c3…

MALICIOUS

Office (OLE) / .XLS

393.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-09
MD5: 44619de5a53ad983d43abd77162ba38c SHA-1: 968b45a3526a725a9238e1cc5a8f7092787b8c54 SHA-256: eeab5dc8c68422c3b7b6725f0f49bb148f12ee2bf56f25e84fcf92c2275f582a
108 Risk Score

Malware Insights

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

The critical heuristic firing for CVE-2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a vulnerability within the Equation Editor OLE object. This suggests the file is designed to execute arbitrary code upon opening. No VBA macros were found to contain executable statements, but the presence of the OLE object is sufficient evidence of exploitation.

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
cb33da0ab69277ab499cb19374ce956fafd083e82c463852ed2176cc50c49570		 ole-package OLE Ole10Native stream: MBD01D7FB2C/oLe10NaTiVE 1523 bytes

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