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

Static analysis result for SHA-256 be5e804110d4b0a9…

MALICIOUS

Office (OLE) / .XLS

208.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-05-09
MD5: abe832bed6fac08497f512425ba0b82c SHA-1: 9ce4879121098a235589de80f6183ecf2a8782d4 SHA-256: be5e804110d4b0a978f95431e4eb2b1eeef4d855f3fd2944bf890bb5c447e901
148 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded Equation Editor OLE object. Heuristics indicate this object exploits CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. The VBA macros are present but do not contain executable statements, suggesting the primary malicious functionality is within the OLE object. The file is therefore likely used to deliver a second-stage payload via this exploit.

Heuristics 4

  • 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.
  • x86 GetPC stub (CALL $+5; POP EAX) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EAX)
  • 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
8d867d17785245626fde41ec1acbd20d1822106a53e39d290fdc5f1bfde497d7		 ole-package OLE Ole10Native stream: MBD03527CD0/OlE10natIve 1574 bytes

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