remcos | 5eefc105d5ab9d2d68363b9789bf36a21556e5c22d3f5e22ecfa7471749c027f

Analysis

max time kernel
150s
max time network
154s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
14-01-2025 13:33

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General

Target

DEMANDA LABORAL POR ABUSO DE CONFIANZA 6154/msimg32.dll
Size

4.5MB
MD5

5c8efc44873f7b3206bf6848cda5a910
SHA1

513f40cf130c25b2ce5fbc1d4461db1b11003b06
SHA256

1dbaf868164cb30ad1841278748fea090d2b6e0862aea240c498afe41f2ad4de
SHA512

65c037efe8e0c90a491756115f8f8e31440aa07631d7e19e30ab6a55bcd0fded7539ac4a26515f0c75d1114b87c3c6c4242b6e495bedd6f7ae3406b682ab86e4
SSDEEP

98304:Q7cVE/ETJBs0YTUaoP2MNT9L/fO3Jajv:Q7cVE/ETJBs0NRLnO5a

Score

10^/10

remcos remotehost discovery rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

masterosamell32.kozow.com:6565

Attributes

audio_folder
MicRecords
audio_path
ApplicationPath
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
Remcos
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-3J5KKR
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
take_screenshot_option
false
take_screenshot_time
5

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Remcos family
remcos

Blocklisted process makes network request 64 IoCs

flow	pid	Process
18	4604	rundll32.exe
20	4604	rundll32.exe
21	4604	rundll32.exe
23	4604	rundll32.exe
27	4604	rundll32.exe
29	4604	rundll32.exe
30	4604	rundll32.exe
31	4604	rundll32.exe
32	4604	rundll32.exe
33	4604	rundll32.exe
34	4604	rundll32.exe
35	4604	rundll32.exe
36	4604	rundll32.exe
39	4604	rundll32.exe
44	4604	rundll32.exe
49	4604	rundll32.exe
52	4604	rundll32.exe
54	4604	rundll32.exe
55	4604	rundll32.exe
56	4604	rundll32.exe
57	4604	rundll32.exe
58	4604	rundll32.exe
59	4604	rundll32.exe
60	4604	rundll32.exe
61	4604	rundll32.exe
62	4604	rundll32.exe
63	4604	rundll32.exe
64	4604	rundll32.exe
65	4604	rundll32.exe
66	4604	rundll32.exe
67	4604	rundll32.exe
68	4604	rundll32.exe
69	4604	rundll32.exe
70	4604	rundll32.exe
71	4604	rundll32.exe
74	4604	rundll32.exe
76	4604	rundll32.exe
77	4604	rundll32.exe
78	4604	rundll32.exe
79	4604	rundll32.exe
80	4604	rundll32.exe
81	4604	rundll32.exe
82	4604	rundll32.exe
83	4604	rundll32.exe
84	4604	rundll32.exe
85	4604	rundll32.exe
86	4604	rundll32.exe
87	4604	rundll32.exe
88	4604	rundll32.exe
89	4604	rundll32.exe
90	4604	rundll32.exe
91	4604	rundll32.exe
92	4604	rundll32.exe
93	4604	rundll32.exe
94	4604	rundll32.exe
95	4604	rundll32.exe
100	4604	rundll32.exe
102	4604	rundll32.exe
103	4604	rundll32.exe
104	4604	rundll32.exe
105	4604	rundll32.exe
106	4604	rundll32.exe
107	4604	rundll32.exe
108	4604	rundll32.exe

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	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4604	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4604	rundll32.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4976 wrote to memory of 4148	4976	rundll32.exe	83
PID 4976 wrote to memory of 4148	4976	rundll32.exe	83
PID 4976 wrote to memory of 4148	4976	rundll32.exe	83
PID 4148 wrote to memory of 4604	4148	rundll32.exe	89
PID 4148 wrote to memory of 4604	4148	rundll32.exe	89
PID 4148 wrote to memory of 4604	4148	rundll32.exe	89
PID 4148 wrote to memory of 4604	4148	rundll32.exe	89
PID 4148 wrote to memory of 4604	4148	rundll32.exe	89

C:\Windows\system32\rundll32.exe
rundll32.exe "C:\Users\Admin\AppData\Local\Temp\DEMANDA LABORAL POR ABUSO DE CONFIANZA 6154\msimg32.dll",#1
1⤵
- Suspicious use of WriteProcessMemory
PID:4976
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe "C:\Users\Admin\AppData\Local\Temp\DEMANDA LABORAL POR ABUSO DE CONFIANZA 6154\msimg32.dll",#1
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4148
- - C:\Windows\SysWOW64\rundll32.exe
    "C:\Windows\SysWOW64\rundll32.exe"
    3⤵
    - Blocklisted process makes network request
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of SetWindowsHookEx
    PID:4604

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

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:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
813a7ad46fe651b01979a17484c52396

SHA1
7ed3cb868fc6f4b83060cbcdd16f0de89f4a1a79

SHA256
113de9b86fc45e61bb495b3adec69f0e3a6f6dd3e08d836cfd265928c1b8bb40

SHA512
1dfe1880a736cc98a695f8923764deba5009dd59a6f8e0f898a1a6acd473138f0f899808754b7c846a83187819149fd0d784aa492124a5511fe192fef96e89d0

Download Submit
memory/4148-1-0x0000000010020000-0x000000001003F000-memory.dmp

Filesize
124KB

Download
memory/4148-0-0x0000000010000000-0x0000000010486000-memory.dmp

Filesize
4.5MB

Download
memory/4148-5-0x0000000010000000-0x0000000010486000-memory.dmp

Filesize
4.5MB

Download
memory/4148-4-0x0000000010000000-0x0000000010486000-memory.dmp

Filesize
4.5MB

Download
memory/4148-3-0x0000000010000000-0x0000000010486000-memory.dmp

Filesize
4.5MB

Download
memory/4148-6-0x0000000010000000-0x0000000010486000-memory.dmp

Filesize
4.5MB

Download
memory/4148-9-0x0000000010000000-0x0000000010486000-memory.dmp

Filesize
4.5MB

Download
memory/4148-13-0x0000000010265000-0x0000000010292000-memory.dmp

Filesize
180KB

Download
memory/4148-12-0x0000000010255000-0x000000001025C000-memory.dmp

Filesize
28KB

Download
memory/4148-11-0x0000000010020000-0x000000001003F000-memory.dmp

Filesize
124KB

Download
memory/4604-38-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-45-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-17-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-14-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-10-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-19-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-8-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-20-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-21-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-22-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-23-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-24-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-25-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-27-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-28-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-29-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-30-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-31-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-32-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-33-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-35-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-36-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-37-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-7-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-39-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-40-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-41-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-42-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-43-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-18-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-46-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-47-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-48-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-49-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-50-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-51-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-53-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-54-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-55-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-56-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-57-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-58-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-59-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-61-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-62-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-63-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-64-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-65-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-66-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-67-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-68-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-70-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-71-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-72-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-73-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-74-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-75-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-77-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-78-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download
memory/4604-79-0x00000000010A0000-0x0000000001120000-memory.dmp

Filesize
512KB

Download