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

Static analysis result for SHA-256 3e6b26ab8c78be47…

MALICIOUS

Office (OLE) / .XLS

393.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-08
MD5: 2c772967c0f3c0609a474525d61fbb4a SHA-1: fb6ae2df474b84496fa59f60727b61ffb4a3aeb5 SHA-256: 3e6b26ab8c78be47ef47d1f09526674b692f96dea2e2e622581b07d01088bd22
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1059.005 Visual Basic

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in the Equation Editor component of Microsoft Office. This technique is commonly used to deliver secondary payloads. While VBA macros were present, they contained no executable statements, suggesting the primary malicious functionality resides 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 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
00b482587ec4dec6c91f5988107045d2c7778771d045abaa93a8004583931d7f		 ole-package OLE Ole10Native stream: MBD0155E855/oLe10NaTIvE 1905 bytes

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