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

Static analysis result for SHA-256 3ae17c5cffe7fb62…

MALICIOUS

Office (OLE) / .XLS

564.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-14
MD5: d83cdb48b608193e70813788e7efa33c SHA-1: 8e73f012a87509faa1adebf47c88fb60b909d18f SHA-256: 3ae17c5cffe7fb62b7248b85e23a52d2dcb343726f21d93736517d1acb0d08d4
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 that the file contains a payload exploiting this known vulnerability in Microsoft Equation Editor. The presence of an OLE object related to Equation Editor further supports this. While VBA macros were detected, they contained no executable statements, suggesting the primary malicious functionality is delivered via the Equation Editor exploit.

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 3

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
aebfa3cc9cffd1af88424a4828f90c2a91932c7006bd1640e9ae65f18d99a7e2		 ole-package OLE Ole10Native stream: MBD007C8BC8/Ole10Native 167172 bytes
ole10native_01.bin
302c9503d5f3ceef7657752b583713e951ddaa904a6ce21bf64aac9bdfe0bc16		 ole-package OLE Ole10Native stream: MBD007C8BCA/Ole10NatIVE 1491 bytes

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