Office (OLE) / .XLS malware analysis — malicious · 7abd46f22576537b

MALICIOUS

Office (OLE) / .XLS

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

MD5: a3621fc5c36afa378c9925f4f5d9cc3c SHA-1: 58855c33c799704683cb71446243659a37531a4b SHA-256: 7abd46f22576537b302459c073eb1ff5a13200aa7b8073c987f7adc43c06e2db

422 Risk Score

Malware Insights

MITRE ATT&CK

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

This XLS file contains VBA macros, including a Workbook_Open event, which is a common technique for automatic execution. The macros utilize WScript.Shell and CreateObject to download and execute a file from a remote source, as indicated by the 'OLE_VBA_HTTP_DROP_EXEC' heuristic. The specific URL for the download is not directly visible due to obfuscation, but the presence of the downloaded file 'macros.bas' is noted.

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-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.
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` `4c84075266ec486ffcb5cdda5813b4b3991e5ff8b92e42b664f7a7a4bdfce1ee`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	15522 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 69 long base64-like blob(s).

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