46664efe2204787719a152719c072d5d301ba8965c9317cf08ab627412eaef4b

Analysis

max time kernel
149s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
28/12/2023, 20:26

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General

Target

f5d155a7877be88833507b9373602bc3.exe
Size

982KB
MD5

f5d155a7877be88833507b9373602bc3
SHA1

7a60f05af359ee7cd730f837b73b304eafaf253d
SHA256

46664efe2204787719a152719c072d5d301ba8965c9317cf08ab627412eaef4b
SHA512

4be5da454539f6e1d95fd8677e40e96fe6dc263a740234b2fc39211204b4c568e8ad53e10545569dab559950b9a40ad9d05842efb38d62adc4b8be00544f8f8e
SSDEEP

12288:FSjzwRzH1RighUFZzHtC9FDY8c8H+Lm/yjxeiSOHTApwn2fTrNsef1JOX1:geVRrhMxY9FDY8cLa/OerzTrNtS

Score

10^/10

persistence

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "C:\\Windows\\csrss.exe"	csrss.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1232405761-1209240240-3206092754-1000\Control Panel\International\Geo\Nation	f5d155a7877be88833507b9373602bc3.exe

Executes dropped EXE 1 IoCs

pid	Process
1652	csrss.exe

Drops file in Windows directory 6 IoCs

description	ioc	Process
File opened for modification	C:\Windows\csrss.exe	f5d155a7877be88833507b9373602bc3.exe
File opened for modification	C:\Windows\winlogs.dll	csrss.exe
File opened for modification	C:\Windows\csrss.exe	csrss.exe
File created	C:\Windows\winlogs.dll	f5d155a7877be88833507b9373602bc3.exe
File opened for modification	C:\Windows\winlogs.dll	f5d155a7877be88833507b9373602bc3.exe
File created	C:\Windows\csrss.exe	f5d155a7877be88833507b9373602bc3.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeSystemtimePrivilege	1652	csrss.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1652	csrss.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 3108 wrote to memory of 1652	3108	f5d155a7877be88833507b9373602bc3.exe	93
PID 3108 wrote to memory of 1652	3108	f5d155a7877be88833507b9373602bc3.exe	93
PID 3108 wrote to memory of 1652	3108	f5d155a7877be88833507b9373602bc3.exe	93

C:\Users\Admin\AppData\Local\Temp\f5d155a7877be88833507b9373602bc3.exe
"C:\Users\Admin\AppData\Local\Temp\f5d155a7877be88833507b9373602bc3.exe"
1⤵
- Checks computer location settings
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:3108
- C:\Windows\csrss.exe
  "C:\Windows\csrss.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Drops file in Windows directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  PID:1652

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1652-36-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/1652-38-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/1652-25-0x00000000025C0000-0x00000000025C1000-memory.dmp

Filesize
4KB

Download
memory/1652-31-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/1652-32-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/1652-33-0x00000000025C0000-0x00000000025C1000-memory.dmp

Filesize
4KB

Download
memory/1652-34-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/1652-35-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/1652-45-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/1652-44-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/1652-37-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/1652-39-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/1652-40-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/1652-41-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/1652-42-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/1652-43-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/3108-0-0x00000000022C0000-0x00000000022C1000-memory.dmp

Filesize
4KB

Download
memory/3108-27-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads