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

Static analysis result for SHA-256 a579d0b705185f55…

MALICIOUS

Office (OLE) / .XLS

1.03 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-25
MD5: 768b4fdf9eb74f35ccc942f5d7781eef SHA-1: 12831b407cd266ae56b2884a94b35ecf6503ccda SHA-256: a579d0b705185f55e7fa599681d06601ed89468ed46160d631b54fefb1706ac2
108 Risk Score

Malware Insights

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

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within the Equation Editor OLE object. While no VBA macros were found to contain executable statements, the presence of the exploit suggests the file is designed to execute arbitrary code upon opening. The file is an Excel spreadsheet, and the exploit targets a vulnerability in the Equation Editor component.

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
ed8da65f0f0a4cc2a905cfcf1ae916bf05ced375ebeefae9a837c8bf84ad6699		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3618 bytes
ole10native_00.bin
45473ecb4459ceb2aa733a2e957b8c922b19b4759dda0da369b14abc65b8d022		 ole-package OLE Ole10Native stream: MBD02A887C6/OlE10natIVe 2100 bytes

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