Office (OLE) / .XLS malware analysis — malicious · 619834708c823655

MALICIOUS

Office (OLE) / .XLS

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

MD5: e26a531fc331deefc14a0d0ed551ad02 SHA-1: f5a97d9840e08ee5b4f595187050d3de9a8ec9a6 SHA-256: 619834708c823655706de814652326d8dd0e2bc5a6027be6b787fb54036f0dff

270 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The Workbook_Open macro executes cmd.exe to run a command that appears to be intended to download and execute a VBScript payload. The script is constructed from concatenated strings, including a hardcoded path to cmd.exe and a filename 'ipconfig.vbs' which is written to the temporary directory. The macro also attempts to write to a registry Run key, indicating persistence.

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` `06be45c36cc2c8ca506364cd80e72195b4ec9aa5ae4b71aa33b9fd4772582d23`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	4119 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s).

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