facd2dcb2a1382593dd63d2517819b20aa27b7ceb83df4ca5e0c2143d290833e

Analysis

max time kernel
141s
max time network
97s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
25/09/2024, 20:34

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General

Target

taxcalc.exe
Size

2.1MB
MD5

224dacf13fdc6208c259e80b60930bd9
SHA1

eef52ca52d0f4f9a25571109af2338c7a5cbfec5
SHA256

0daca8eedcc0dec62533adfe8f223d7c32f62ab61766916271af392379eae4f9
SHA512

a568732cb75b665603517f48034bf7fd2c658360809325c873454f2597d8981c143a0aa7adc74e658cfc6e230eeeae63bc8d186fa339b591de16838a5c3b356e
SSDEEP

49152:wCZN2Ev2HSNchehklLKsWuGtTMx5UMt6cd3:iscDmsWVw5UMt/

Score

7^/10

discovery upx

Malware Config

Signatures

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-1-5-21-945322488-2060912225-3527527000-1000\Control Panel\International\Geo\Nation	taxcalc.exe

Executes dropped EXE 1 IoCs

pid	Process
1484	setup.exe

UPX packed file 3 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x000c0000000234c9-4.dat	upx
behavioral2/memory/1484-8-0x0000000000400000-0x000000000043A000-memory.dmp	upx
behavioral2/memory/1484-15-0x0000000000400000-0x000000000043A000-memory.dmp	upx

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	taxcalc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	setup.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
1484	setup.exe
1484	setup.exe
1484	setup.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4972 wrote to memory of 1484	4972	taxcalc.exe	82
PID 4972 wrote to memory of 1484	4972	taxcalc.exe	82
PID 4972 wrote to memory of 1484	4972	taxcalc.exe	82

C:\Users\Admin\AppData\Local\Temp\taxcalc.exe
"C:\Users\Admin\AppData\Local\Temp\taxcalc.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4972
- C:\Users\Admin\AppData\Local\Temp\RarSFX0\setup.exe
  "C:\Users\Admin\AppData\Local\Temp\RarSFX0\setup.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:1484

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\RarSFX0\setup.exe

Filesize
3.5MB

MD5
6fcf034db68409a4b9086c8c7b6e41ec

SHA1
899c5982391f7d55408db1813672e85a47f87bd8

SHA256
b12f0be5b11504774819052cc1f5c381ee0b073fe00832faa9bcadff354f8de7

SHA512
5e708dfa0cae9bfefbb576dccbd5e36d006b9c50528b7c3f591f852614d1530b69ee89068bd17b612b9abbe2568c01a5191d9a13af28d4d5527c66487d90690c

Download Submit
memory/1484-8-0x0000000000400000-0x000000000043A000-memory.dmp

Filesize
232KB

Download
memory/1484-15-0x0000000000400000-0x000000000043A000-memory.dmp

Filesize
232KB

Download
memory/4972-14-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download