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

Static analysis result for SHA-256 189996679f652943…

MALICIOUS

Office (OLE) / .XLS

1.03 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-23
MD5: b7713a0d10d407a7f5d217f90f41f5ce SHA-1: 4c58123795fdca406d634e14cbefe0abb49631a9 SHA-256: 189996679f652943641f7302e110bf72eb7954c5b6ad73305d9325c65cce9ac0
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: Malicious Attachment T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The file contains a malicious OLE object exploiting CVE-2017-11882 in Microsoft Equation Editor. While the VBA macros themselves do not contain executable statements, the embedded Equation Editor object is known to deliver a second-stage payload. The presence of the Equation Editor OLE object and the specific heuristic firing strongly indicate exploitation of this known vulnerability.

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
8e80a373ebb4c537387fd941ec3310ecca1ebad6f44719ebcb4e77af62739455		 ole-package OLE Ole10Native stream: MBD028E4209/olE10NAtive 1813 bytes

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