Office (OOXML) / .XLSX malware analysis — malicious · cd589f856df07fda

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 3facdb98f37a25ca0776ccad1582d660 SHA-1: 1f2136e35f3645f347afd140e9783a6654646d16 SHA-256: cd589f856df07fda6dfbaeb2cf7e921dc5726d869fab92cc6f23295f25dcc72f

380 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The OOXML file contains a VBA macro with an Auto_Open function that utilizes Shell() and WScript.Shell to execute a Base64-decoded command. This command downloads and executes a PE file from the URL http://5.189.132.254/StmAX.exe, indicating a downloader or droppper functionality.

Heuristics 9

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.
Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
VBA Base64-decoded Shell command stager critical OLE_VBA_BASE64_SHELL_COMMAND_STAGER

VBA auto-exec macro decodes Base64 string literals into command or script-launch text and executes the result with Shell. This catches cmd/cscript/PowerShell/VBS launchers hidden from plain keyword matching.

URL http://5.189.132.254/StmAX.exe
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` `9a2b2b35c2ee098c5d1fbd30078e3352c43ffc1cd29b28ab9bd8e0c5ee1bd31e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	11683 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution 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` `d21fbb69c6b9b3209b0efab55a84abcdd733168e8f5e4b8d2b1612894c5c4bfc`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject3.bin	5936 bytes
`ooxml_oleobject_01.bin` `695b8287e8be9e672915f25f9651436d17180cbc70fd92b78a45136025127865`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	3584 bytes
`ooxml_oleobject_01_ole10native_00.bin` `c8dec3e8c8566058182c8d96db22380307c82e23a5bafd541358aa4283203a3f`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	934 bytes
`ooxml_oleobject_02.bin` `177d9bf7ff33768829026a2666545fe445b41411f3fa4b39379606b4a338db0e`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject2.bin	8704 bytes
`ooxml_oleobject_02_ole10native_00.bin` `c521c5faf7e718117e8a0cab32c1191a014b353d268021f937c815970d4de0cb`	ole-package	OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native	6137 bytes
`ooxml_oleobject_03.bin` `2b9c1f9371942278b559879e0cc74937ba5fde8fc7fccc3018ee8c92dcd06651`	ooxml-ole-object	OOXML embedded OLE part: xl/vbaProject.bin	31232 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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