Office (OOXML) / .XLSM malware analysis — malicious · 2e804e01b16ef71c

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: ecd760bcaa980ee203be6ac8504a8120 SHA-1: 5fe2d3685022dfc7e22b0631adfe58844fb57cd7 SHA-256: 2e804e01b16ef71c8be40399948c4cb586766501474ba8e196b82de3728eee7c

320 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 User Execution: Malicious File T1559.002 Component Object Model Hijacking T1059.003 Command and Scripting Interpreter: Windows Command Shell

The sample is an XLSM file containing VBA macros, including an Auto_Open macro, which is a common delivery mechanism. It exploits CVE-2017-11882 through an embedded Equation Editor object. The embedded object contains a command stager that attempts to execute 'cmd /c ren %tmp%\zz v&cScripT %tmp%\v?..wsf ..C', indicating it likely downloads and executes a second-stage payload.

Heuristics 8

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.
ClamAV: Xls.Malware.Generic-8058593-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Generic-8058593-0
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` `b3eeab8500ce068e097e828da7b0c4363950fdf665417d77b0ad580e6413db7b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	21997 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). 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` `1d1c1bac71be057d5b1b375e1f5909cb2700b43c24eedca0d67c9d7aecc64c5c`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject2.bin	12288 bytes
`ooxml_oleobject_00_ole10native_00.bin` `821916df38fbece0788fccb280b093cce6b95d2e706634253e24690007400d1f`	ole-package	OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native	9365 bytes
`ooxml_oleobject_01.bin` `34c62d7efb0cd8a5530883751abcb747feed6a801f0faa6dae06ac2c6fb5b89a`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	3584 bytes
`ooxml_oleobject_01_ole10native_00.bin` `d99c181abf8b5977a8477fba0a081b3da9352dfd157ec3932f34ab5986dd0a0b`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	1311 bytes
`ooxml_oleobject_02.bin` `96d3b52fc3a0d8ce2f54074934ddfbf668f92423f1d1580bdfe8d36e263859a8`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject3.bin	5936 bytes
`ooxml_oleobject_03.bin` `a3a2baf8bc7d9de92ee9d022248490606b60a9bb60c5c7663b5079d1c20ae926`	ooxml-ole-object	OOXML embedded OLE part: xl/vbaProject.bin	38400 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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