Office (OLE) / .XLS malware analysis — malicious · 672a907427a33e44

MALICIOUS

Office (OLE) / .XLS

47.0 KB Created: 2022-04-18 09:37:27 Authoring application: Microsoft Excel First seen: 2022-04-29

MD5: 16621efd1fcb469c4dd2cf3b08c99359 SHA-1: b11bc398b50bc3a6ab0571a8f30777d86f65c47c SHA-256: 672a907427a33e44ed76b2c260ef0420c09654c73ceba350b23690089365441e

270 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a malicious Excel file containing a Workbook_Open VBA macro. This macro uses CreateObject to execute cmd.exe with the '/c' flag, attempting to run a dynamically created VBScript payload named 'ipconfig.vbs' in the user's temporary directory. The VBScript itself is constructed from concatenated hexadecimal strings, indicating obfuscation to evade detection.

Heuristics 9

Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
cmd.exe reference in VBA high OLE_VBA_CMD

cmd.exe reference in VBA
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)
Suspicious extracted artifact info 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `c4c463e1bacc05f0bc5beeec92fbabe9fcea52d3d4b01153cba2ab26a579660a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	5866 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s).

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