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

Static analysis result for SHA-256 a3b45fbaf5ab308a…

MALICIOUS

Office (OLE) / .XLS

170.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-06-13
MD5: 402f2768c025bccb0ed44a36c35bf482 SHA-1: 1b2b43323417849c69e82ccac805d25c5f1ceaa9 SHA-256: a3b45fbaf5ab308ab7399159d7cd4e5c364466f04b7c9f739d9c5b4d2717f33a
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within an Equation Editor OLE object. This vulnerability is commonly used to achieve arbitrary code execution when the document is opened. 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 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
a2cf9043b329b29692333fec4e5efd2d47480b3e227b278edd4d7c7218d8ea1f		 ole-package OLE Ole10Native stream: MBD00995F95/ole10NatIVE 1547 bytes

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