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

Summary | ZeroBOX

crt.exe

Emotet Gen1 Malicious Library UPX dll PE64 MZP Format PE File OS Processor Check PE32 DLL DllRegisterServer

Category	Machine	Started	Completed
FILE	s1_win7_x6401	Aug. 5, 2024, 3:37 p.m.	Aug. 5, 2024, 3:41 p.m.

Size	3.9MB
Type	PE32 executable (GUI) Intel 80386, for MS Windows
MD5	`f0958ee9db38d69ba0c9757926f0b895`
SHA256	`637ea245c49ca562049a4faced1103f39034155c042c0cc390792ee38de10a52`
CRC32	`A24CC634`
ssdeep	`98304:Njn9yImq73ws2G3PWiG9QSttqN9UJYhmMd4m:B9Lmqrn+iG9jWNmM+m`
Yara	Malicious_Library_Zero - Malicious_Library PE_Header_Zero - PE File Signature IsPE32 - (no description) UPX_Zero - UPX packed file Win32_Trojan_Emotet_2_Zero - Win32 Trojan Emotet mzp_file_format - MZP(Delphi) file format

crt.exe "C:\Users\test22\AppData\Local\Temp\crt.exe"
2592
- crt.tmp "C:\Users\test22\AppData\Local\Temp\is-LHPNH.tmp\crt.tmp" /SL5="$80178,3802635,54272,C:\Users\test22\AppData\Local\Temp\crt.exe"
  2644

Name	Response	Post-Analysis Lookup
No hosts contacted.

IP Address	Status	Action
No hosts contacted.

Suricata Alerts

No Suricata Alerts

Suricata TLS

No Suricata TLS

Checks if process is being debugged by a debugger (1 event)

Time & API	Arguments	Status	Return	Repeated
IsDebuggerPresent Aug. 5, 2024, 3:37 p.m.			0	0

Checks amount of memory in system, this can be used to detect virtual machines that have a low amount of memory available (1 event)

Time & API	Arguments	Status	Return	Repeated
GlobalMemoryStatusEx Aug. 5, 2024, 3:37 p.m.		1	1	0

The executable contains unknown PE section names indicative of a packer (could be a false positive) (3 events)

section	CODE
section	DATA
section	BSS

Allocates read-write-execute memory (usually to unpack itself) (6 events)

Time & API	Arguments	Status	Return	Repeated
NtProtectVirtualMemory Aug. 5, 2024, 3:37 p.m.	process_identifier: 2592 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x00400000 process_handle: 0xffffffff	1	0	0
NtProtectVirtualMemory Aug. 5, 2024, 3:37 p.m.	process_identifier: 2592 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 40960 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x00401000 process_handle: 0xffffffff	1	0	0
NtProtectVirtualMemory Aug. 5, 2024, 3:37 p.m.	process_identifier: 2592 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 20480 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x0040f000 process_handle: 0xffffffff	1	0	0
NtProtectVirtualMemory Aug. 5, 2024, 3:37 p.m.	process_identifier: 2592 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x73bc2000 process_handle: 0xffffffff	1	0	0
NtAllocateVirtualMemory Aug. 5, 2024, 3:37 p.m.	process_identifier: 2644 region_size: 4096 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x003e0000 allocation_type: 4096 (MEM_COMMIT) process_handle: 0xffffffff	1	0	0
NtProtectVirtualMemory Aug. 5, 2024, 3:37 p.m.	process_identifier: 2644 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x73bc2000 process_handle: 0xffffffff	1	0	0

Creates executable files on the filesystem (2 events)

file	C:\Users\test22\AppData\Local\Temp\is-ASMSV.tmp\_isetup\_shfoldr.dll
file	C:\Users\test22\AppData\Local\Temp\is-ASMSV.tmp\_isetup\_iscrypt.dll

Drops an executable to the user AppData folder (4 events)

file	C:\Users\test22\AppData\Local\Temp\is-ASMSV.tmp\_isetup\_shfoldr.dll
file	C:\Users\test22\AppData\Local\Temp\is-LHPNH.tmp\crt.tmp
file	C:\Users\test22\AppData\Local\Temp\is-ASMSV.tmp\_isetup\_iscrypt.dll
file	C:\Users\test22\AppData\Local\Temp\is-ASMSV.tmp\_isetup\_RegDLL.tmp