Office (OLE) / .XLS malware analysis — malicious · 2f9f4cf6fc4d7463

MALICIOUS

Office (OLE) / .XLS

140.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2022-11-28

MD5: bb2e0b8ba59ae98acf632e7abdc19bd1 SHA-1: f5bc74fc9bdb70d3cf5cb2f26cc1bc9d34fd8d28 SHA-256: 2f9f4cf6fc4d74634c5152ce02d60b185ba86f0e839b66421ad205d21e7a301c

422 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer T1204.002 Malicious File

The XLS file contains VBA macros, including a Workbook_Open event, which is a common technique for automatic execution upon opening. The macros utilize WScript.Shell and the Shell() function to download and execute a second-stage payload, as indicated by the 'OLE_VBA_HTTP_DROP_EXEC' heuristic. The specific payload and its ultimate destination could not be determined due to obfuscation and truncation.

Heuristics 10

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
ClamAV: Xls.Malware.Valyria-10032145-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Valyria-10032145-0
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.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
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` `c1bc6bac1a96b5d7ce9ef4b87e9e92654cd12587f72ae75f38c187d26daf1a41`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	14773 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 69 long base64-like blob(s).

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