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

Static analysis result for SHA-256 e0451a22f5f14b8b…

MALICIOUS

Office (OLE) / .XLS

90.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-01-19
MD5: 96acef79802842edf68773128a180a2b SHA-1: 359dfa82346c95afbbc0fb3a2c473bcc3114b503 SHA-256: e0451a22f5f14b8ba7355eaf45912270b2e1a25a5cab15e113f7934de0feef6e
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 PowerShell

The sample is an Excel file containing an embedded Equation Editor object that exploits CVE-2017-11882. This vulnerability allows for arbitrary code execution when the object is processed. No VBA macros were found to be executable, but the presence of the exploit object is sufficient for malicious execution. The SHA256 hash is included as an IOC.

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
e781a4affa37f9a60a92354f51810b305a379ff95a2cdeab37e7ff4a1335b444		 ole-package OLE Ole10Native stream: MBD026F5CCF/oLE10nATIVe 1608 bytes

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