Sload Office (OLE) / .XLS malware analysis — malicious · f37a0441c66222c4

MALICIOUS

Office (OLE) / .XLS

38.0 KB Created: 2022-04-07 08:39:00 Authoring application: Microsoft Excel First seen: 2022-04-08

MD5: f0c826a16c6b0f2780e4d0f086ae4a3b SHA-1: 4d33deee3a5e7c8af93c74e925b0e297eebef78b SHA-256: f37a0441c66222c49723f8feae71cdce91423549228a852fb24a99fcb80c5e41

288 Risk Score

Malware Insights

Sload · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059.001 PowerShell

The Workbook_Open macro automatically executes a VBA function that downloads a file from 'https://transfer.sh/7djBeD/FRANK.exe' and saves it as 'dropper.exe' in the user's temporary directory. The ClamAV detection 'Xls.Malware.Sload-7135989-0' and the heuristic firings strongly indicate this is a downloader for the Sload family. The script also attempts to establish persistence by writing to the registry key HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy.

Heuristics 8

ClamAV: Xls.Malware.Sload-7135989-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Sload-7135989-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
GetObject call high OLE_VBA_GETOBJ

GetObject 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` `0dafd6e65b79bda8fb3ac4f0f377179c4afefb9379c12b4b9f5634425151765f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	4386 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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