Office (OOXML) / .XLSM malware analysis — malicious · 9c5046d91c0ea340

MALICIOUS

Office (OOXML) / .XLSM

437.7 KB Created: 2021-07-28 10:37:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: 4b8a4216a4d3bb881e479668d91ebd12 SHA-1: 604aad1487556770959945571db26116409c16df SHA-256: 9c5046d91c0ea340733f896dddd2b21cf835e4586bbfb453c4000ab947815428

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is an XLSM file containing a Workbook_Open macro. This macro is designed to execute a command that downloads a file named 'payload.exe' from 'http://192.168.1.100/payload.exe' using PowerShell and then executes it. The macro also attempts to establish persistence by writing to the registry key HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy.

Heuristics 5

Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_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
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `8dec24dd6939c7a2d75b7f575b9cd0405ea24536c339e31e1ffdf3c53739e869`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1115 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `ac23089f767e2011c6547f9159431a8b5057276e62c05ab35bb93ae3d4c21383`	vba-project	OOXML VBA project: xl/vbaProject.bin	9216 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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