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

Static analysis result for SHA-256 cfc9ec5acebd081c…

MALICIOUS

Office (OLE) / .XLS

188.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-03-08
MD5: 5c174a8c932844428c54877686885bc6 SHA-1: 63b24045a70890373f79850c8e75e58642ff01e2 SHA-256: cfc9ec5acebd081c1f16545360fcf4ec7067337ac0215f5c1097d5b7a42aaee0
108 Risk Score

Malware Insights

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

The sample is an Excel file containing a malicious OLE object exploiting CVE-2017-11882 in the Equation Editor. While the VBA project itself contains no executable statements, the embedded OLE object is the primary vector for exploitation. This technique is commonly used to download and execute a second-stage payload.

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
56c5f6b2b4f834079c9205517476664c83c6814ae0faae91a9d4db29b848fbe6		 ole-package OLE Ole10Native stream: MBD000400E4/oLe10naTIvE 1846 bytes

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