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

Static analysis result for SHA-256 7cfb5ed8e9d16e96…

MALICIOUS

Office (OLE) / .XLS

208.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-05-08
MD5: 40e74c7303f2ee3c54dce5dd76d38c8b SHA-1: ae749f82d2faf30eef39e6308d5337e5cf88f01d SHA-256: 7cfb5ed8e9d16e9639b704b5991fedfb7abd82c1022fb00a83cf6bb5df31cf27
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 Equation Editor OLE object. This object exploits the CVE-2017-11882 vulnerability, which is known to deliver a second-stage payload. No VBA code was found to be executable, but the presence of the vulnerable OLE object is sufficient evidence 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
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
e7ec0de8d4f5ec97b501696ba7a004d6d5a5c313e5bcf4a74909fa246dba60ec		 ole-package OLE Ole10Native stream: MBD03111EE7/oLE10NaTiVE 1731 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.