b549f798b20871a286548d5d5c4680931db7e71e4fe2cd8ee3b0d940a7d408c8

Analysis

max time kernel
147s
max time network
118s
platform
windows10-2004_x64
resource
win10v2004-20231222-en
resource tags

arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
submitted
01/01/2024, 19:14

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General

Target

3da7290ab9f6875bf88d6941c6cea6e0.exe
Size

15KB
MD5

3da7290ab9f6875bf88d6941c6cea6e0
SHA1

53cf53949d49b84cb504aa6137c64769b64ae6d4
SHA256

b549f798b20871a286548d5d5c4680931db7e71e4fe2cd8ee3b0d940a7d408c8
SHA512

7f9232916854852dd7c1a6ced889e550be533a502d7408cce4af8765f71cf0d5729317158ace40a544a0b6f23fcad6e95e51fa6716ef9c5971ec9715dd6d9bda
SSDEEP

192:a1699UDVZ6EYTfym1dCMkJ8ltpXgR+fHvJOzjGhBXMLoEaK2IKGEJ1:ZQD7TYTf4ytpXgRqROxoEL2I8z

Score

10^/10

persistence upx

Malware Config

Signatures

Adds autorun key to be loaded by Explorer.exe on startup 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad\C:\Windows\fonts\zcwkhkmo.dll = "{4EAA8F86-4217-48D0-A976-389247780A14}"	3da7290ab9f6875bf88d6941c6cea6e0.exe

Loads dropped DLL 2 IoCs

pid	Process
2760	3da7290ab9f6875bf88d6941c6cea6e0.exe
368	regsvr32.exe

UPX packed file 2 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/2760-0-0x0000000000400000-0x0000000000413000-memory.dmp	upx
behavioral2/memory/2760-9-0x0000000000400000-0x0000000000413000-memory.dmp	upx

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\fonts\zcwkhkmo.tmp	3da7290ab9f6875bf88d6941c6cea6e0.exe
File opened for modification	C:\Windows\fonts\gzjxsj01.dat	3da7290ab9f6875bf88d6941c6cea6e0.exe

Modifies registry class 46 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\JXSJ.gzjxatl.1\CLSID	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4EAA8F86-4217-48D0-A976-389247780A14}\Programmable	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{720637CE-65CC-4FCF-9EFA-EDBDE8BFD345}\TypeLib	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{720637CE-65CC-4FCF-9EFA-EDBDE8BFD345}\ProxyStubClsid32	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\JXSJ.gzjxatl.1\CLSID\ = "{4EAA8F86-4217-48D0-A976-389247780A14}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4EAA8F86-4217-48D0-A976-389247780A14}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4EAA8F86-4217-48D0-A976-389247780A14}\ProgID\ = "JXSJ.gzjxatl.1"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4EAA8F86-4217-48D0-A976-389247780A14}\VersionIndependentProgID	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{D67CE309-75A0-459B-8D62-3A5D74239542}\1.0\0	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{D67CE309-75A0-459B-8D62-3A5D74239542}\1.0\0\win32\ = "C:\\Windows\\fonts\\zcwkhkmo.dll"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{D67CE309-75A0-459B-8D62-3A5D74239542}\1.0\HELPDIR\ = "C:\\Windows\\fonts"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{720637CE-65CC-4FCF-9EFA-EDBDE8BFD345}\ProxyStubClsid32	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{720637CE-65CC-4FCF-9EFA-EDBDE8BFD345}\TypeLib\ = "{D67CE309-75A0-459B-8D62-3A5D74239542}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{720637CE-65CC-4FCF-9EFA-EDBDE8BFD345}\ = "Igzjxatl"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{720637CE-65CC-4FCF-9EFA-EDBDE8BFD345}\ProxyStubClsid32\ = "{00020424-0000-0000-C000-000000000046}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\JXSJ.gzjxatl\CLSID\ = "{4EAA8F86-4217-48D0-A976-389247780A14}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\JXSJ.gzjxatl\CurVer\ = "JXSJ.gzjxatl.1"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4EAA8F86-4217-48D0-A976-389247780A14}\ = "gzjxatl Class"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4EAA8F86-4217-48D0-A976-389247780A14}\TypeLib	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4EAA8F86-4217-48D0-A976-389247780A14}\TypeLib\ = "{D67CE309-75A0-459B-8D62-3A5D74239542}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{D67CE309-75A0-459B-8D62-3A5D74239542}	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{D67CE309-75A0-459B-8D62-3A5D74239542}\1.0\FLAGS	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{720637CE-65CC-4FCF-9EFA-EDBDE8BFD345}\ProxyStubClsid32\ = "{00020424-0000-0000-C000-000000000046}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4EAA8F86-4217-48D0-A976-389247780A14}\InprocServer32	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{D67CE309-75A0-459B-8D62-3A5D74239542}\1.0\FLAGS\ = "0"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{D67CE309-75A0-459B-8D62-3A5D74239542}\1.0\0\win32	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\JXSJ.gzjxatl\CurVer	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4EAA8F86-4217-48D0-A976-389247780A14}\InprocServer32\ThreadingModel = "Apartment"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{D67CE309-75A0-459B-8D62-3A5D74239542}\1.0\HELPDIR	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{720637CE-65CC-4FCF-9EFA-EDBDE8BFD345}\TypeLib\Version = "1.0"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\JXSJ.gzjxatl.1\ = "gzjxatl Class"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4EAA8F86-4217-48D0-A976-389247780A14}\InprocServer32\ = "C:\\Windows\\fonts\\zcwkhkmo.dll"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{D67CE309-75A0-459B-8D62-3A5D74239542}\1.0	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{720637CE-65CC-4FCF-9EFA-EDBDE8BFD345}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{720637CE-65CC-4FCF-9EFA-EDBDE8BFD345}\TypeLib\Version = "1.0"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\JXSJ.gzjxatl.1	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\JXSJ.gzjxatl\ = "gzjxatl Class"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4EAA8F86-4217-48D0-A976-389247780A14}\ProgID	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{D67CE309-75A0-459B-8D62-3A5D74239542}\1.0\ = "JXSJ 1.0 Type Library"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{720637CE-65CC-4FCF-9EFA-EDBDE8BFD345}\ = "Igzjxatl"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{720637CE-65CC-4FCF-9EFA-EDBDE8BFD345}\TypeLib	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\JXSJ.gzjxatl	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\JXSJ.gzjxatl\CLSID	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4EAA8F86-4217-48D0-A976-389247780A14}\VersionIndependentProgID\ = "JXSJ.gzjxatl"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{720637CE-65CC-4FCF-9EFA-EDBDE8BFD345}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{720637CE-65CC-4FCF-9EFA-EDBDE8BFD345}\TypeLib\ = "{D67CE309-75A0-459B-8D62-3A5D74239542}"	regsvr32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2760	3da7290ab9f6875bf88d6941c6cea6e0.exe
2760	3da7290ab9f6875bf88d6941c6cea6e0.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeIncBasePriorityPrivilege	2760	3da7290ab9f6875bf88d6941c6cea6e0.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
2760	3da7290ab9f6875bf88d6941c6cea6e0.exe
2760	3da7290ab9f6875bf88d6941c6cea6e0.exe
2760	3da7290ab9f6875bf88d6941c6cea6e0.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2760 wrote to memory of 368	2760	3da7290ab9f6875bf88d6941c6cea6e0.exe	28
PID 2760 wrote to memory of 368	2760	3da7290ab9f6875bf88d6941c6cea6e0.exe	28
PID 2760 wrote to memory of 368	2760	3da7290ab9f6875bf88d6941c6cea6e0.exe	28
PID 2760 wrote to memory of 468	2760	3da7290ab9f6875bf88d6941c6cea6e0.exe	103
PID 2760 wrote to memory of 468	2760	3da7290ab9f6875bf88d6941c6cea6e0.exe	103
PID 2760 wrote to memory of 468	2760	3da7290ab9f6875bf88d6941c6cea6e0.exe	103

C:\Users\Admin\AppData\Local\Temp\3da7290ab9f6875bf88d6941c6cea6e0.exe
"C:\Users\Admin\AppData\Local\Temp\3da7290ab9f6875bf88d6941c6cea6e0.exe"
1⤵
- Adds autorun key to be loaded by Explorer.exe on startup
- Loads dropped DLL
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2760
- C:\Windows\SysWOW64\regsvr32.exe
  regsvr32.exe /s "C:\Windows\fonts\zcwkhkmo.dll"
  2⤵
  - Loads dropped DLL
  - Modifies registry class
  PID:368
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c del C:\Users\Admin\AppData\Local\Temp\3DA729~1.EXE > nul
  2⤵
  PID:468

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/368-8-0x0000000010000000-0x000000001000F000-memory.dmp

Filesize
60KB

Download
memory/2760-0-0x0000000000400000-0x0000000000413000-memory.dmp

Filesize
76KB

Download
memory/2760-10-0x0000000010000000-0x000000001000F000-memory.dmp

Filesize
60KB

Download
memory/2760-9-0x0000000000400000-0x0000000000413000-memory.dmp

Filesize
76KB

Download
memory/2760-15-0x0000000010000000-0x000000001000F000-memory.dmp

Filesize
60KB

Download