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

Static analysis result for SHA-256 7ac6f6e65b013477…

MALICIOUS

Office (OLE) / .XLS

1.03 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-25
MD5: e45ea5aaa54a3695f91201c469b7ca11 SHA-1: 01649340dc8e00fd772eb5982f7cf2697fdcca23 SHA-256: 7ac6f6e65b013477bff079fe6eb4075e00181d2bcae8b515b080a8008cb952e4
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 exploitation of a vulnerability in the Equation Editor. This suggests the file's primary purpose is to execute arbitrary code via this exploit. No VBA macros were found to contain executable statements, but the presence of the Equation Editor OLE object is a strong indicator of malicious intent.

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
65b2cd6b3295fdc3a46341aa5dc621f16c39fec1d84caaf790dd53c916eed13f		 ole-package OLE Ole10Native stream: MBD02A8D047/olE10NATiVe 1822 bytes

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