Office (OLE) / .XLS malware analysis — malicious · b5e6f4ce68a0acec

MALICIOUS

Office (OLE) / .XLS

324.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel

MD5: 2769a5ebf1e43e3b83a79b890a46532d SHA-1: 195cb3223a0ec93974092ef578459e07395981a3 SHA-256: b5e6f4ce68a0acec1f729cf36c44563f41025b36bb8a8425b0f4895d48f84eb5

408 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical OLE_VBA_SHELL and OLE_VBA_WSCRIPT heuristics indicate the use of WScript.Shell within VBA macros. The Workbook_Open macro is present, which is a common technique for auto-execution upon opening the document. The obfuscated VBA script, specifically the `esstgrwghcyptwefdegth` function which reverses and decodes strings, suggests the intent to download and execute a second-stage payload. The script attempts to access the 'Printhood' special folder, likely to stage or execute downloaded content.

Heuristics 10

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
ClamAV: Xls.Malware.Valyria-10032137-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Valyria-10032137-0
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
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.
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 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)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `60bcee3a7637eb1ca326e856073d3b985d7f7d299bf5746b0093771482d8ad15`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	36032 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 141 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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