d7b43b7764a6aad54f95959cb5df8c3af03d2e2e5dbd8995e3cf344414ca8b1b

Analysis

max time kernel
150s
max time network
123s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
08/01/2024, 13:07

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General

Target

4b84da0c5644fe9c4a1f716968f94bc9.exe
Size

14KB
MD5

4b84da0c5644fe9c4a1f716968f94bc9
SHA1

f09dad14f88368b27d26238b8b91fab47e21bd3f
SHA256

d7b43b7764a6aad54f95959cb5df8c3af03d2e2e5dbd8995e3cf344414ca8b1b
SHA512

62d30393f9253b8e66b0c6c13ed91a3b65f08e0084c5360b7cdd6de693329da181a6695958cf321a311e6db01092123837c29e98387ee920b2a2434c98290870
SSDEEP

384:monK/sS4BMER9HEyCIQ/D9YiplKdShDxLKV:moK0S4FBEyCxPpHh9G

Score

8^/10

persistence upx

Malware Config

Signatures

Modifies AppInit DLL entries 2 TTPs
persistence

Registry Run Keys / Startup Folder
T1547.001

Modify Registry
T1112

Deletes itself 1 IoCs

pid	Process
2684	cmd.exe

Executes dropped EXE 1 IoCs

pid	Process
2840	ezcronk.exe

Loads dropped DLL 2 IoCs

pid	Process
2500	4b84da0c5644fe9c4a1f716968f94bc9.exe
2500	4b84da0c5644fe9c4a1f716968f94bc9.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2500-0-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral1/files/0x000b000000014249-3.dat	upx
behavioral1/memory/2500-4-0x0000000000230000-0x0000000000242000-memory.dmp	upx
behavioral1/memory/2840-12-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral1/memory/2500-13-0x0000000000400000-0x0000000000412000-memory.dmp	upx

Drops file in System32 directory 3 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\ezcron.dll	4b84da0c5644fe9c4a1f716968f94bc9.exe
File created	C:\Windows\SysWOW64\ezcronk.exe	4b84da0c5644fe9c4a1f716968f94bc9.exe
File opened for modification	C:\Windows\SysWOW64\ezcronk.exe	4b84da0c5644fe9c4a1f716968f94bc9.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2500 wrote to memory of 2840	2500	4b84da0c5644fe9c4a1f716968f94bc9.exe	28
PID 2500 wrote to memory of 2840	2500	4b84da0c5644fe9c4a1f716968f94bc9.exe	28
PID 2500 wrote to memory of 2840	2500	4b84da0c5644fe9c4a1f716968f94bc9.exe	28
PID 2500 wrote to memory of 2840	2500	4b84da0c5644fe9c4a1f716968f94bc9.exe	28
PID 2500 wrote to memory of 2684	2500	4b84da0c5644fe9c4a1f716968f94bc9.exe	30
PID 2500 wrote to memory of 2684	2500	4b84da0c5644fe9c4a1f716968f94bc9.exe	30
PID 2500 wrote to memory of 2684	2500	4b84da0c5644fe9c4a1f716968f94bc9.exe	30
PID 2500 wrote to memory of 2684	2500	4b84da0c5644fe9c4a1f716968f94bc9.exe	30

C:\Users\Admin\AppData\Local\Temp\4b84da0c5644fe9c4a1f716968f94bc9.exe
"C:\Users\Admin\AppData\Local\Temp\4b84da0c5644fe9c4a1f716968f94bc9.exe"
1⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:2500
- C:\Windows\SysWOW64\ezcronk.exe
  C:\Windows\system32\ezcronk.exe ˜‰
  2⤵
  - Executes dropped EXE
  PID:2840
- C:\Windows\SysWOW64\cmd.exe
  cmd /c C:\Users\Admin\AppData\Local\Temp\4b84da0c5644fe9c4a1f716968f94bc9.exe.bat
  2⤵
  - Deletes itself
  PID:2684

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

C:\Users\Admin\AppData\Local\Temp\4b84da0c5644fe9c4a1f716968f94bc9.exe.bat

Filesize
182B

MD5
b04d444dc130097a6fc84a07eeef9e5d

SHA1
7ae482f66001277c48c206026d593c5ee965904d

SHA256
7afa7355bf8fc5438ec06d3ab84d6df7b4a3e32230f9f950428c337a38f612fc

SHA512
6c334c38eee69533a1579c0d05c050ef37bce017fad1b6057c577ffa6346140982e39c25645609f5403483910adf142abeeaf1bd629a43cac7a3d143d2d8f665

Download Submit
\Windows\SysWOW64\ezcronk.exe

Filesize
14KB

MD5
4b84da0c5644fe9c4a1f716968f94bc9

SHA1
f09dad14f88368b27d26238b8b91fab47e21bd3f

SHA256
d7b43b7764a6aad54f95959cb5df8c3af03d2e2e5dbd8995e3cf344414ca8b1b

SHA512
62d30393f9253b8e66b0c6c13ed91a3b65f08e0084c5360b7cdd6de693329da181a6695958cf321a311e6db01092123837c29e98387ee920b2a2434c98290870

Download Submit
memory/2500-0-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2500-4-0x0000000000230000-0x0000000000242000-memory.dmp

Filesize
72KB

Download
memory/2500-11-0x0000000000230000-0x0000000000242000-memory.dmp

Filesize
72KB

Download
memory/2500-13-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2500-17-0x0000000000230000-0x0000000000242000-memory.dmp

Filesize
72KB

Download
memory/2840-12-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download