Office (OOXML) / .XLSM malware analysis — malicious · a36edb16a18f9850

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 223f15ea1c19e0139ed5f7af72a3a327 SHA-1: 187c8687676f87c91531637d6e2163270b55b9d7 SHA-256: a36edb16a18f9850e4acf0e087b56347c81ca2e6042243e5e6b37bd11a4c8669

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is an XLSM file containing a Workbook_Open macro. This macro uses CreateObject to execute a command. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy clipboard content into a shell. The macro reconstructs the command to be executed as 'cmd.exe /c "C:\Users\Public\Documents\IAccessible2Proxy.exe"' and writes a string to a file that is likely the payload. The macro also attempts to establish persistence by writing to the registry key HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy.

Heuristics 6

Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE

Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
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` `4218b2a49c1e67fc022775de3c5f64a2bea58417fd2710ed86292279de8f86d6`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1164 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` `3113aaf322c4f5c71dc9d61f107e6fca313c37ac40d12c9d3cd62525d228675c`	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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