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

Static analysis result for SHA-256 24d8d0cd1e106a28…

MALICIOUS

Office (OLE) / .XLS

297.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-04-28
MD5: 67d7fe098580fcec08fea2accb7d1db9 SHA-1: de5e98ab4cb710446bdb3ee4373e4cc24ec5923e SHA-256: 24d8d0cd1e106a28a1eefe8764b86da6fad6380c04e3641384ff05e5f50180ab
148 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded Equation Editor OLE object. Static analysis identified a critical heuristic firing for CVE-2017_11882_EQUATION_OLE10NATIVE, indicating the exploitation of this known vulnerability. The VBA macros themselves do not contain executable statements, but the embedded OLE object is the primary vector for exploitation.

Heuristics 4

  • 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.
  • x86 GetPC stub (CALL $+5; POP EDX) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EDX)
  • 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
2e9021b0046338febc289af11da8eaeae7ff356116f472d842d6de5c92ed81c6		 ole-package OLE Ole10Native stream: MBD0234F42A/ole10nATiVe 1698 bytes

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