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Guide 2020-06-10
Version history 2020-06-10

Summary | ZeroBOX

chart-1352129573.xls

MSOffice File

Category	Machine	Started	Completed
FILE	s1_win7_x6403_us	Sept. 25, 2021, 5 p.m.	Sept. 25, 2021, 5:02 p.m.

Size	245.5KB
Type	Composite Document File V2 Document, Little Endian, Os: Windows, Version 10.0, Code page: 1251, Last Saved By: Vdgtjghk, Name of Creating Application: Microsoft Excel, Create Time/Date: Fri Jun 5 18:19:34 2015, Last Saved Time/Date: Fri Sep 24 09:37:12 2021, Security: 0
MD5	`3b0372de1f2116a802bc35e1000841d6`
SHA256	`1d9b090fc4be999d9d3043a19bbf6c6d1f1d740d5d6253cd618bb9462d5cc2e2`
CRC32	`F03BA3BD`
ssdeep	`6144:mKpb8rGYrMPe3q7Q0XV5xtuEsi8/dg79nWXcZZVtjKFOTDwvO0PDUlQvS32no7X1:79ndjjKoTDwvbDS3fLvfH1GOP`
Yara	Microsoft_Office_File_Zero - Microsoft Office File

EXCEL.EXE "C:\Program Files (x86)\Microsoft Office\Office15\EXCEL.EXE" C:\Users\test22\AppData\Local\Temp\chart-1352129573.xls
2516
- regsvr32.exe "C:\Windows\System32\regsvr32.exe" C:\Datop\test1.test
  2816
- regsvr32.exe "C:\Windows\System32\regsvr32.exe" C:\Datop\test.test
  2136
- regsvr32.exe "C:\Windows\System32\regsvr32.exe" C:\Datop\test2.test
  2864

Name	Response	Post-Analysis Lookup
new.americold.com
thietbiagt.com	A 210.245.90.247	210.245.90.247
finejewels.com.au	A 192.124.249.84	192.124.249.84

IP Address	Status	Action
164.124.101.2	Active	Moloch
192.124.249.84	Active	Moloch
210.245.90.247	Active	Moloch

Suricata Alerts

Flow	SID	Signature	Category
TCP 192.168.56.103:49168 -> 192.124.249.84:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 192.168.56.103:49174 -> 210.245.90.247:443	2230002	SURICATA TLS invalid record type	Generic Protocol Command Decode
TCP 192.168.56.103:49172 -> 210.245.90.247:443	2230002	SURICATA TLS invalid record type	Generic Protocol Command Decode
TCP 192.168.56.103:49174 -> 210.245.90.247:443	2230010	SURICATA TLS invalid record/traffic	Generic Protocol Command Decode
TCP 192.168.56.103:49172 -> 210.245.90.247:443	2230010	SURICATA TLS invalid record/traffic	Generic Protocol Command Decode
TCP 192.168.56.103:49172 -> 210.245.90.247:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 210.245.90.247:443 -> 192.168.56.103:49172	2230002	SURICATA TLS invalid record type	Generic Protocol Command Decode
TCP 210.245.90.247:443 -> 192.168.56.103:49172	2230010	SURICATA TLS invalid record/traffic	Generic Protocol Command Decode
TCP 192.124.249.84:443 -> 192.168.56.103:49170	2029340	ET INFO TLS Handshake Failure	Potentially Bad Traffic
TCP 192.168.56.103:49169 -> 192.124.249.84:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 192.168.56.103:49173 -> 210.245.90.247:443	2230002	SURICATA TLS invalid record type	Generic Protocol Command Decode
TCP 192.168.56.103:49173 -> 210.245.90.247:443	2230010	SURICATA TLS invalid record/traffic	Generic Protocol Command Decode
TCP 192.168.56.103:49173 -> 210.245.90.247:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 210.245.90.247:443 -> 192.168.56.103:49173	2230002	SURICATA TLS invalid record type	Generic Protocol Command Decode
TCP 210.245.90.247:443 -> 192.168.56.103:49173	2230010	SURICATA TLS invalid record/traffic	Generic Protocol Command Decode
TCP 210.245.90.247:443 -> 192.168.56.103:49174	2230002	SURICATA TLS invalid record type	Generic Protocol Command Decode
TCP 210.245.90.247:443 -> 192.168.56.103:49174	2230010	SURICATA TLS invalid record/traffic	Generic Protocol Command Decode

Suricata TLS

No Suricata TLS

Allocates read-write-execute memory (usually to unpack itself) (3 events)

Time & API	Arguments	Status	Return	Repeated
NtProtectVirtualMemory Sept. 25, 2021, 5 p.m.	process_identifier: 2516 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x6bf98000 process_handle: 0xffffffff	1	0	0
NtProtectVirtualMemory Sept. 25, 2021, 5 p.m.	process_identifier: 2516 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x6b0f2000 process_handle: 0xffffffff	1	0	0
NtProtectVirtualMemory Sept. 25, 2021, 5 p.m.	process_identifier: 2816 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x6c471000 process_handle: 0xffffffff	1	0	0

Creates a suspicious process (6 events)

cmdline	regsvr32 C:\Datop\test.test
cmdline	"C:\Windows\System32\regsvr32.exe" C:\Datop\test2.test
cmdline	"C:\Windows\System32\regsvr32.exe" C:\Datop\test1.test
cmdline	"C:\Windows\System32\regsvr32.exe" C:\Datop\test.test
cmdline	regsvr32 C:\Datop\test1.test
cmdline	regsvr32 C:\Datop\test2.test

Changes read-write memory protection to read-execute (probably to avoid detection when setting all RWX flags at the same time) (1 event)

Time & API	Arguments	Status	Return	Repeated
NtProtectVirtualMemory Sept. 25, 2021, 5 p.m.	process_identifier: 2516 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 1 length: 4096 protection: 32 (PAGE_EXECUTE_READ) base_address: 0x7ef70000 process_handle: 0xffffffff	1	0	0

Network communications indicative of a potential document or script payload download was initiated by the process excel.exe (3 events)

Time & API	Arguments	Status	Return	Repeated
URLDownloadToFileW Sept. 25, 2021, 5 p.m.	url: https://finejewels.com.au/w3wU4YqfP/say.html stack_pivoted: 0 filepath_r: C:\Datop\test.test filepath: C:\Datop\test.test		2148270085	0
URLDownloadToFileW Sept. 25, 2021, 5 p.m.	url: https://thietbiagt.com/1OLxyr4H/say.html stack_pivoted: 0 filepath_r: C:\Datop\test1.test filepath: C:\Datop\test1.test		2148270085	0
URLDownloadToFileW Sept. 25, 2021, 5 p.m.	url: https://new.americold.com/4Tn6Vu2ML/say.html stack_pivoted: 0 filepath_r: C:\Datop\test2.test filepath: C:\Datop\test2.test		2148270085	0

One or more non-whitelisted processes were created (6 events)

parent_process	excel.exe				martian_process	regsvr32 C:\Datop\test.test
parent_process	excel.exe				martian_process	"C:\Windows\System32\regsvr32.exe" C:\Datop\test2.test
parent_process	excel.exe				martian_process	"C:\Windows\System32\regsvr32.exe" C:\Datop\test1.test
parent_process	excel.exe				martian_process	"C:\Windows\System32\regsvr32.exe" C:\Datop\test.test
parent_process	excel.exe				martian_process	regsvr32 C:\Datop\test1.test
parent_process	excel.exe				martian_process	regsvr32 C:\Datop\test2.test

The process excel.exe wrote an executable file to disk which it then attempted to execute (1 event)

file	C:\Windows\System32\regsvr32.exe