b8ec727d4f97edaaa8ddeeac3673a1aed94ee95aacde5f93e66fc0db30c3dec8

Resubmissions

19/07/2023, 14:51

230719-r8eq4ahe6y 7

13/07/2023, 09:59

230713-lz4e7shb3w 7

26/10/2022, 22:29

221026-2d749sheg4 8

Analysis

max time kernel
2700s
max time network
2318s
platform
windows10-1703_x64
resource
win10-20230703-de
resource tags

arch:x64arch:x86image:win10-20230703-delocale:de-deos:windows10-1703-x64systemwindows
submitted
19/07/2023, 14:51

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target

b8ec727d4f97edaaa8ddeeac3673a1aed94ee95aacde5f93e66fc0db30c3dec8.exe
Size

24KB
MD5

06aa6f3e7fb5872e3ad8cbba6733aadd
SHA1

bc4477eb999719d9e808b78cc38a5fa0bd992fb2
SHA256

b8ec727d4f97edaaa8ddeeac3673a1aed94ee95aacde5f93e66fc0db30c3dec8
SHA512

68c17800e1f751e66ea4eee7ed4448d9f1bb3051e685bf6b4965e53723ec2ff028cbaa8c706aec3896b3f918ec8ac88d6e1d241c071bfcb5fdde1b1fe33fdfa8
SSDEEP

768:Kx/JRDAkCiEwnqlqsQlTpQJ0oxzVMzfz0qbnthtXh:Kx/JRQikwFZuJ0oxzmzfIe7x

Score

7^/10

persistence upx

Malware Config

Signatures

Deletes itself 1 IoCs

pid	Process
1012	csrss.exe

Executes dropped EXE 1 IoCs

pid	Process
1012	csrss.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1388-120-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral1/files/0x000800000001af42-122.dat	upx
behavioral1/files/0x000800000001af42-125.dat	upx
behavioral1/memory/1388-124-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral1/memory/1012-126-0x0000000000400000-0x0000000000412000-memory.dmp	upx

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\csrss = "C:\\Windows\\csrss.exe"	b8ec727d4f97edaaa8ddeeac3673a1aed94ee95aacde5f93e66fc0db30c3dec8.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run	b8ec727d4f97edaaa8ddeeac3673a1aed94ee95aacde5f93e66fc0db30c3dec8.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\csrss.exe	b8ec727d4f97edaaa8ddeeac3673a1aed94ee95aacde5f93e66fc0db30c3dec8.exe
File created	C:\Windows\csrss.exe	b8ec727d4f97edaaa8ddeeac3673a1aed94ee95aacde5f93e66fc0db30c3dec8.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe
1012	csrss.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1012	csrss.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1388 wrote to memory of 1012	1388	b8ec727d4f97edaaa8ddeeac3673a1aed94ee95aacde5f93e66fc0db30c3dec8.exe	70
PID 1388 wrote to memory of 1012	1388	b8ec727d4f97edaaa8ddeeac3673a1aed94ee95aacde5f93e66fc0db30c3dec8.exe	70
PID 1388 wrote to memory of 1012	1388	b8ec727d4f97edaaa8ddeeac3673a1aed94ee95aacde5f93e66fc0db30c3dec8.exe	70

C:\Users\Admin\AppData\Local\Temp\b8ec727d4f97edaaa8ddeeac3673a1aed94ee95aacde5f93e66fc0db30c3dec8.exe
"C:\Users\Admin\AppData\Local\Temp\b8ec727d4f97edaaa8ddeeac3673a1aed94ee95aacde5f93e66fc0db30c3dec8.exe"
1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:1388
- C:\Windows\csrss.exe
  C:\Windows\csrss.exe "C:\Users\Admin\AppData\Local\Temp\b8ec727d4f97edaaa8ddeeac3673a1aed94ee95aacde5f93e66fc0db30c3dec8.exe"
  2⤵
  - Deletes itself
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1012

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Windows\csrss.exe

Filesize
24KB

MD5
06aa6f3e7fb5872e3ad8cbba6733aadd

SHA1
bc4477eb999719d9e808b78cc38a5fa0bd992fb2

SHA256
b8ec727d4f97edaaa8ddeeac3673a1aed94ee95aacde5f93e66fc0db30c3dec8

SHA512
68c17800e1f751e66ea4eee7ed4448d9f1bb3051e685bf6b4965e53723ec2ff028cbaa8c706aec3896b3f918ec8ac88d6e1d241c071bfcb5fdde1b1fe33fdfa8

Download Submit
C:\Windows\csrss.exe

Filesize
24KB

MD5
06aa6f3e7fb5872e3ad8cbba6733aadd

SHA1
bc4477eb999719d9e808b78cc38a5fa0bd992fb2

SHA256
b8ec727d4f97edaaa8ddeeac3673a1aed94ee95aacde5f93e66fc0db30c3dec8

SHA512
68c17800e1f751e66ea4eee7ed4448d9f1bb3051e685bf6b4965e53723ec2ff028cbaa8c706aec3896b3f918ec8ac88d6e1d241c071bfcb5fdde1b1fe33fdfa8

Download Submit
memory/1012-126-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1388-120-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1388-124-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download