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

Static analysis result for SHA-256 38661fc2ada2deea…

MALICIOUS

Office (OLE) / .XLS

1.71 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-09
MD5: 578ded3f250d228ab69bf49250bfef8a SHA-1: 6fae8735bc436a74e689acb67185a34b6532d20b SHA-256: 38661fc2ada2deea37d86d9b529685fd5b9986b39d8ca08460d0ed03cb690fe7
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing indicates the presence of a CVE-2017-11882 exploit targeting the Equation Editor OLE object. This vulnerability is commonly used to execute arbitrary code. While no VBA macros were found to be executable, the presence of the exploit object strongly suggests the file's purpose is to leverage this known vulnerability for initial execution.

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
1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2412 bytes
ole10native_00.bin
f774604b11fe3138885b934604e68682bca42062a8d05ddf5fcd322e48a72905		 ole-package OLE Ole10Native stream: MBD0049A0E0/ole10NAtiVe 1719 bytes

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