Office (OOXML) / .XLSM malware analysis — malicious · 4fe44edf1ea52b98

MALICIOUS

Office (OOXML) / .XLSM

51.8 KB Created: 2020-02-01 18:28:07 UTC Authoring application: Microsoft Excel 12.0000

MD5: 31265015caa10da501ba41b8d11cfe52 SHA-1: 796568fe600fbaf043fcc81d344a4b2990cb283d SHA-256: 4fe44edf1ea52b985381e90597c679ff63172ba1eadbd4598cfbdd95c4cef49e

260 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1059.005 Command and Scripting Interpreter: Visual Basic

The XLSM file contains a VBA macro with an Auto_Open entry point, indicating immediate execution upon opening. A critical heuristic identified the CVE-2017-11882 exploit within an embedded Equation Editor object. This exploit is designed to execute a command, which in this case appears to be a stager that downloads and runs a second-stage payload from a remote location, likely using PowerShell or a similar scripting mechanism. The presence of the Equation Editor object and the auto-executing VBA macro strongly suggest a malicious intent to compromise the user's system.

Heuristics 7

CVE-2017-11882 — Equation Editor command stager critical CVE likely CVE_2017_11882_EQUATION_NATIVE_CMD

Embedded Equation Editor OLE data contains an invalid Equation Native/MTEF stream with an embedded command stager. This is likely CVE-2017-11882 exploitation because the vulnerable Equation Editor component is reached and the malformed native stream directly carries process-launch bytes.
Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/oleObject3.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
Embedded OLE object medium OOXML_OLE_OBJECT

Document contains an embedded OLE object

Extracted artifacts 9

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `d872813d658c79f4a50051eb675c993dd0ab3a5928f7bf6d304cb0630fe31eee`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	38108 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`ooxml_oleobject_00.bin` `c40ce9d0e63bcae0cc63ebc6002bc7adb6eca1b5a3c36908b12184d951e296b5`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject2.bin	28160 bytes
`ooxml_oleobject_00_ole10native_00.bin` `a2543edcc68a1aad3cb0e9b75bddb89ff63aead87f649cbcf61f572e532febc3`	ole-package	OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native	25194 bytes
`ooxml_oleobject_01.bin` `334256009eea283fa693653c573614dea40ebb32fe07427f7b7c9cfd482ebae0`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	22016 bytes
`ooxml_oleobject_01_ole10native_00.bin` `c0f5be23e20a938779d83a9a948e09d6f3134689728b98b02658ee5ed940988b`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	19288 bytes
`ooxml_oleobject_02.bin` `8303f651522ffaefb8e9c3d2f29ba6841a31c1e0704f82b85ef01f39ef9b716e`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject3.bin	5936 bytes
`ooxml_oleobject_03.bin` `214b7fbf71dcfb59d77aea6d49b10fb9c6b529ec433645516df5561cf838e706`	ooxml-ole-object	OOXML embedded OLE part: xl/vbaProject.bin	58368 bytes
`emf_00.emf` `979dde2aed02f077c16ae53546c6df9eed40e8386d6db6fc36aee9f966d2cb82`	ooxml-emf	OOXML EMF part: xl/media/image1.emf	4968 bytes
`emf_01.emf` `4d4d1e7b04c99dcb8e885915068ad6f74cc2333e91580cdae5ccaa00c427247f`	ooxml-emf	OOXML EMF part: xl/media/image2.emf	1536 bytes

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