bc1820b92e6e103feaebc3c31d049f30a73bea472f75fee441823035128227a7

Analysis

max time kernel
151s
max time network
191s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
31/12/2023, 12:46

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General

Target

System99-Bootstrapper.exe
Size

855KB
MD5

dc6d365686fdefc10972b32f226f79df
SHA1

dc44f556541b307035b3962ddfc5335e1d21f6cb
SHA256

bc1820b92e6e103feaebc3c31d049f30a73bea472f75fee441823035128227a7
SHA512

d1d9aea41949c0ff1f4290f7c55c7dff4c42cbd19d6f0583ee32cb09b481abf94669391e0185515f27deaa46ebe7c1cbacfca2bebf3f1b0133254f92c40271b9
SSDEEP

12288:xTL/hRu+71W3Bad9PlePNfdPcC/buH5qRQvTAaIUfLrjpeMQOTh:pL/hRu+71WkdRlqpdr/6FMUfLrjsgh

Score

8^/10

Malware Config

Signatures

Downloads MZ/PE file

Executes dropped EXE 1 IoCs

pid	Process
2364	Win64u.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\System32\Win64u.exe	System99-Bootstrapper.exe

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
3280	schtasks.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2364	Win64u.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2976 wrote to memory of 4564	2976	System99-Bootstrapper.exe	90
PID 2976 wrote to memory of 4564	2976	System99-Bootstrapper.exe	90
PID 4564 wrote to memory of 3280	4564	cmd.exe	92
PID 4564 wrote to memory of 3280	4564	cmd.exe	92
PID 2976 wrote to memory of 2364	2976	System99-Bootstrapper.exe	93
PID 2976 wrote to memory of 2364	2976	System99-Bootstrapper.exe	93

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

cURL User-Agent 1 IoCs

Uses User-Agent string associated with cURL utility.

description	flow	ioc
HTTP User-Agent header	26	curl/8.4.0-DEV

C:\Users\Admin\AppData\Local\Temp\System99-Bootstrapper.exe
"C:\Users\Admin\AppData\Local\Temp\System99-Bootstrapper.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:2976
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c schtasks /create /tn "Win64ub" /tr Win64ub.exe /sc onstart /ru system /F
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4564
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "Win64ub" /tr Win64ub.exe /sc onstart /ru system /F
    3⤵
    - Creates scheduled task(s)
    PID:3280
- C:\Windows\System32\Win64u.exe
  "C:\Windows\System32\Win64u.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2364

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\System32\Win64u.exe

Filesize
278KB

MD5
44d13d4b7b2f6a26e7812e099072dbfa

SHA1
c9a21cdf0d7d392d579c61ee33cb9e68abe90591

SHA256
160831ba186338229a94f19f9ca96e9a4b42dcdb5c37d4777172d1a4b8b8b5a4

SHA512
684c145344aa8aaed204d2712100ddbc9b40abebaa4796e1c45b8b5fdc7f2ddae71b1d762316b4814685effe258aa2033404d5a7e1e886eaec1db83bf0486527

Download Submit
memory/2364-6-0x0000006BDBAE0000-0x0000006BDBBE0000-memory.dmp

Filesize
1024KB

Download
memory/2364-9-0x0000006BDBAE0000-0x0000006BDBBE0000-memory.dmp

Filesize
1024KB

Download
memory/2364-10-0x0000006BDBAE0000-0x0000006BDBBE0000-memory.dmp

Filesize
1024KB

Download
memory/2364-11-0x0000006BDBAE0000-0x0000006BDBBE0000-memory.dmp

Filesize
1024KB

Download
memory/2364-12-0x0000006BDBAE0000-0x0000006BDBBE0000-memory.dmp

Filesize
1024KB

Download
memory/2364-13-0x0000006BDBAE0000-0x0000006BDBBE0000-memory.dmp

Filesize
1024KB

Download
memory/2364-14-0x0000006BDBAE0000-0x0000006BDBBE0000-memory.dmp

Filesize
1024KB

Download
memory/2364-15-0x0000006BDBAE0000-0x0000006BDBBE0000-memory.dmp

Filesize
1024KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads