66cf7d06e6cf6413d3e9e6a488f7528f5c6d06057abec20496f70d1691fbdfb2

Analysis

max time kernel
143s
max time network
126s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
11-08-2024 23:20

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General

Target

Downloads 12.6.24/Downloads 12.6.24/Downloads/Loud Chair.exe
Size

18.9MB
MD5

e85d8cd73a221953c10c6ae719c4daae
SHA1

a78ad50dd874b8a159c1300035927ffae558930f
SHA256

320d56906b73e07663ae65f53e6ee1008042e3ecdd640f34d60e48c035fa7eb5
SHA512

10c36ff7963159f6b76e80105aefefef3d6a075ad6d9d9a79397ce4f24f9f2f8deed59033543b0722614340ac9a9524c466509c609458b0160d826bc8e77fcd2
SSDEEP

393216:Infyt2vkj2gwfhbjlZDnJAKqnPg69iG4C7NH:tt2Q2XtRtnmVFJp

Score

8^/10

evasion

Malware Config

Signatures

Downloads MZ/PE file

Looks for VMWare Tools registry key 2 TTPs 2 IoCs

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

Processes:

Loud Chair.exeldr_YuZkgLm.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SOFTWARE\VMware, Inc.\VMware Tools	Loud Chair.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\VMware, Inc.\VMware Tools	ldr_YuZkgLm.exe

Deletes itself 1 IoCs

Processes:

Loud Chair.exe

pid process

4152 Loud Chair.exe
Executes dropped EXE 1 IoCs

Processes:

ldr_YuZkgLm.exe

pid process

1860 ldr_YuZkgLm.exe
Loads dropped DLL 1 IoCs

Processes:

ldr_YuZkgLm.exe

pid process

1860 ldr_YuZkgLm.exe
Checks for VirtualBox DLLs, possible anti-VM trick 1 TTPs 2 IoCs
Certain files are specific to VirtualBox VMs and can be used to detect execution in a VM.

System Information Discovery
T1082

Processes:

Loud Chair.exeldr_YuZkgLm.exe

description ioc process

File opened (read-only) \??\VBoxMiniRdrDN Loud Chair.exe
File opened (read-only) \??\VBoxMiniRdrDN ldr_YuZkgLm.exe

pid	process
1860	ldr_YuZkgLm.exe

pid	process
1860	ldr_YuZkgLm.exe

description	ioc	process
File opened (read-only)	\??\VBoxMiniRdrDN	Loud Chair.exe
File opened (read-only)	\??\VBoxMiniRdrDN	ldr_YuZkgLm.exe

Suspicious behavior: EnumeratesProcesses 26 IoCs

Processes:

Loud Chair.exeldr_YuZkgLm.exe

pid	process
4152	Loud Chair.exe
4152	Loud Chair.exe
4152	Loud Chair.exe
4152	Loud Chair.exe
4152	Loud Chair.exe
4152	Loud Chair.exe
1860	ldr_YuZkgLm.exe
1860	ldr_YuZkgLm.exe
1860	ldr_YuZkgLm.exe
1860	ldr_YuZkgLm.exe
1860	ldr_YuZkgLm.exe
1860	ldr_YuZkgLm.exe
1860	ldr_YuZkgLm.exe
1860	ldr_YuZkgLm.exe
1860	ldr_YuZkgLm.exe
1860	ldr_YuZkgLm.exe
1860	ldr_YuZkgLm.exe
1860	ldr_YuZkgLm.exe
1860	ldr_YuZkgLm.exe
1860	ldr_YuZkgLm.exe
1860	ldr_YuZkgLm.exe
1860	ldr_YuZkgLm.exe
1860	ldr_YuZkgLm.exe
1860	ldr_YuZkgLm.exe
1860	ldr_YuZkgLm.exe
1860	ldr_YuZkgLm.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

ldr_YuZkgLm.exe

pid process

1860 ldr_YuZkgLm.exe
Suspicious behavior: RenamesItself 1 IoCs

Processes:

Loud Chair.exe

pid process

4152 Loud Chair.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

ldr_YuZkgLm.exe

pid process

1860 ldr_YuZkgLm.exe

pid	process
1860	ldr_YuZkgLm.exe

pid	process
1860	ldr_YuZkgLm.exe

Suspicious use of WriteProcessMemory 2 IoCs

Processes:

Loud Chair.exe

description	pid	process	target process
PID 4152 wrote to memory of 1860	4152	Loud Chair.exe	ldr_YuZkgLm.exe
PID 4152 wrote to memory of 1860	4152	Loud Chair.exe	ldr_YuZkgLm.exe

cURL User-Agent 3 IoCs
Uses User-Agent string associated with cURL utility.

Processes:

description flow ioc

HTTP User-Agent header 35 curl/8.4.0-DEV
HTTP User-Agent header 25 curl/8.4.0-DEV
HTTP User-Agent header 27 curl/8.4.0-DEV

description	flow	ioc
HTTP User-Agent header	35	curl/8.4.0-DEV
HTTP User-Agent header	25	curl/8.4.0-DEV
HTTP User-Agent header	27	curl/8.4.0-DEV

C:\Users\Admin\AppData\Local\Temp\Downloads 12.6.24\Downloads 12.6.24\Downloads\Loud Chair.exe
"C:\Users\Admin\AppData\Local\Temp\Downloads 12.6.24\Downloads 12.6.24\Downloads\Loud Chair.exe"
1⤵
- Looks for VMWare Tools registry key
- Deletes itself
- Checks for VirtualBox DLLs, possible anti-VM trick
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: RenamesItself
- Suspicious use of WriteProcessMemory
PID:4152

C:\Users\Admin\AppData\Local\Temp\Downloads 12.6.24\Downloads 12.6.24\Downloads\ldr_YuZkgLm.exe
"ldr_YuZkgLm.exe" "C:\Users\Admin\AppData\Local\Temp\Downloads 12.6.24\Downloads 12.6.24\Downloads\Loud Chair.exe"
2⤵
- Looks for VMWare Tools registry key
- Executes dropped EXE
- Loads dropped DLL
- Checks for VirtualBox DLLs, possible anti-VM trick
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of SetWindowsHookEx
PID:1860

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\Downloads 12.6.24\Downloads 12.6.24\Downloads\ldr_YuZkgLm.exe

Filesize
17.7MB

MD5
be91f737d091cefe7e9a2b5ff5977940

SHA1
e91eee49cc72f60b1e508f223325930d49279017

SHA256
3499a62a6d2925919c64129ed353a87b7ad81ca136eac6e69e411f2018ceb3eb

SHA512
953bce8ff0fdb9b8da371b1747e6c8278bd36f042816f0777a15ad12f4799524576090901024362aaf34e99ec3163563622202f27996fa4a47a41527f60c1ade

Download Submit
memory/1860-17-0x00007FFBEF170000-0x00007FFBEF172000-memory.dmp

Filesize
8KB

Download
memory/1860-19-0x00007FF6A8720000-0x00007FF6AA699000-memory.dmp

Filesize
31.5MB

Download
memory/1860-23-0x00007FF6A8720000-0x00007FF6AA699000-memory.dmp

Filesize
31.5MB

Download
memory/4152-0-0x00007FFBEF170000-0x00007FFBEF172000-memory.dmp

Filesize
8KB

Download
memory/4152-2-0x00007FF757EC7000-0x00007FF758AAF000-memory.dmp

Filesize
11.9MB

Download
memory/4152-1-0x00007FF757D20000-0x00007FF759DA0000-memory.dmp

Filesize
32.5MB

Download
memory/4152-6-0x00007FF757D20000-0x00007FF759DA0000-memory.dmp

Filesize
32.5MB

Download
memory/4152-15-0x00007FF757D20000-0x00007FF759DA0000-memory.dmp

Filesize
32.5MB

Download
memory/4152-16-0x00007FF757EC7000-0x00007FF758AAF000-memory.dmp

Filesize
11.9MB

Download