remcos | 4fbb3a4d7e916d2a0fa703d00ceb900eb4b97cf3a5c8af800db0aa82537a9411

General

Target

bff043ef9ac0fb9c21eee2eb9f92fbdc.exe
Size

1.4MB
MD5

bff043ef9ac0fb9c21eee2eb9f92fbdc
SHA1

18a4d754ac37da6cd5078b1e42d5573d6abf343c
SHA256

4fbb3a4d7e916d2a0fa703d00ceb900eb4b97cf3a5c8af800db0aa82537a9411
SHA512

4710598f504810dce09534d88a3d36614ebef5354175a03790d2e7a1814d4e34995381d1fe6e368aef46c4859cac499e30dc88cea5c24bea885d80d4852d65ac
SSDEEP

24576:s6yJMY9UFoRDhkeYM1jJR97zUbia9JVe0hs5WfBiERJchVML1bT6ES:zY9UORVOM1jJHzaiape0hsABFRJch6Lm

Score

10^/10

remcos graced rat rezer0 upx

Malware Config

Extracted

Family

remcos

Version

2.5.0 Pro

Botnet

GRACED

C2

thankyoulord.ddns.net:5050

Attributes

audio_folder
MicRecords
audio_path
%AppData%
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
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
Remcos-0S5XD9
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
remcos
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title
wikipedia;solitaire;

Signatures

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

ReZer0 packer 1 IoCs

Detects ReZer0, a packer with multiple versions used in various campaigns.

rezer0

Processes:

resource	yara_rule
behavioral1/memory/3044-9-0x00000000004D0000-0x00000000004FC000-memory.dmp	rezer0

Executes dropped EXE 1 IoCs

Processes:

test.exe

pid process

3044 test.exe
Loads dropped DLL 1 IoCs

Processes:

cmd.exe

pid process

2944 cmd.exe

pid	process
3044	test.exe

pid	process
2944	cmd.exe

UPX packed file 2 IoCs

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

upx

Processes:

resource	yara_rule
behavioral1/memory/2924-1-0x0000000000400000-0x00000000006F1000-memory.dmp	upx
behavioral1/memory/2924-31-0x0000000000400000-0x00000000006F1000-memory.dmp	upx

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064
Suspicious use of SetThreadContext 1 IoCs

Processes:

test.exe

description pid process target process

PID 3044 set thread context of 2536 3044 test.exe vbc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
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

Processes:

schtasks.exe

pid process

2620 schtasks.exe

description	pid	process	target process
PID 3044 set thread context of 2536	3044	test.exe	vbc.exe

pid	process
2620	schtasks.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

bff043ef9ac0fb9c21eee2eb9f92fbdc.execmd.exetest.exe

description	pid	process	target process
PID 2924 wrote to memory of 2944	2924	bff043ef9ac0fb9c21eee2eb9f92fbdc.exe	cmd.exe
PID 2924 wrote to memory of 2944	2924	bff043ef9ac0fb9c21eee2eb9f92fbdc.exe	cmd.exe
PID 2924 wrote to memory of 2944	2924	bff043ef9ac0fb9c21eee2eb9f92fbdc.exe	cmd.exe
PID 2924 wrote to memory of 2944	2924	bff043ef9ac0fb9c21eee2eb9f92fbdc.exe	cmd.exe
PID 2944 wrote to memory of 3044	2944	cmd.exe	test.exe
PID 2944 wrote to memory of 3044	2944	cmd.exe	test.exe
PID 2944 wrote to memory of 3044	2944	cmd.exe	test.exe
PID 2944 wrote to memory of 3044	2944	cmd.exe	test.exe
PID 3044 wrote to memory of 2620	3044	test.exe	schtasks.exe
PID 3044 wrote to memory of 2620	3044	test.exe	schtasks.exe
PID 3044 wrote to memory of 2620	3044	test.exe	schtasks.exe
PID 3044 wrote to memory of 2620	3044	test.exe	schtasks.exe
PID 3044 wrote to memory of 2536	3044	test.exe	vbc.exe
PID 3044 wrote to memory of 2536	3044	test.exe	vbc.exe
PID 3044 wrote to memory of 2536	3044	test.exe	vbc.exe
PID 3044 wrote to memory of 2536	3044	test.exe	vbc.exe
PID 3044 wrote to memory of 2536	3044	test.exe	vbc.exe
PID 3044 wrote to memory of 2536	3044	test.exe	vbc.exe
PID 3044 wrote to memory of 2536	3044	test.exe	vbc.exe
PID 3044 wrote to memory of 2536	3044	test.exe	vbc.exe
PID 3044 wrote to memory of 2536	3044	test.exe	vbc.exe
PID 3044 wrote to memory of 2536	3044	test.exe	vbc.exe
PID 3044 wrote to memory of 2536	3044	test.exe	vbc.exe

C:\Users\Admin\AppData\Local\Temp\bff043ef9ac0fb9c21eee2eb9f92fbdc.exe
"C:\Users\Admin\AppData\Local\Temp\bff043ef9ac0fb9c21eee2eb9f92fbdc.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2924

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c test.exe
2⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2944

C:\Users\Admin\AppData\Local\Temp\test.exe
test.exe
3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3044

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\vXAlJeWc" /XML "C:\Users\Admin\AppData\Local\Temp\tmp3BA9.tmp"
4⤵
- Creates scheduled task(s)
PID:2620

C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
"{path}"
4⤵
PID:2536

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Scripting

1

T1064

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Scripting

1

T1064

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\test.exe
Filesize
330KB

MD5
261aa73f93c90dcec0c36a51cb9b5dee

SHA1
b0c41e06cd2ded81706820423db40bf8fea2c957

SHA256
ae160b749914bd56aecbcf43d56a59bde2069a145682b2911fe50c6adabe1b54

SHA512
7b90335b4a7db7b5056f6d60db642754038dc544bd2c1f82e68b1f8e339bf70227f0c08d157b4ca1004448fab7d109f0239196f242d0edeab978de9025a3c0ed

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp3BA9.tmp
Filesize
1KB

MD5
dbea4ed1cb9825e7aff5002c8d5cb9cd

SHA1
a821510ebee738dcd1d7c1b0f5ef9b3b1a8b971a

SHA256
20e27da3c8ec961c93ecc897d5c7383d790eda7a15c65f2b00c9a257e036c02c

SHA512
731fc308d4bdbcf803cb9a81d0c65f8a0908dee6ca6f299ea82e84e37d23dd4e3afe7d0b340ed7d4603dd541c38c615a714e7de76b33ee68b95ba39f6e218ba5

Download Submit
memory/2536-28-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2536-40-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2536-52-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2536-50-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2536-48-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2536-46-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2536-23-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2536-21-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2536-25-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

Filesize
4KB

Download
memory/2536-19-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2536-26-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2536-17-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2536-16-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2536-15-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2536-54-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2536-44-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2536-30-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2536-42-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2536-32-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2536-33-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2536-34-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2536-36-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2924-31-0x0000000000400000-0x00000000006F1000-memory.dmp

Filesize
2.9MB

Download
memory/2924-1-0x0000000000400000-0x00000000006F1000-memory.dmp

Filesize
2.9MB

Download
memory/3044-6-0x0000000074420000-0x0000000074B0E000-memory.dmp

Filesize
6.9MB

Download
memory/3044-7-0x0000000004CD0000-0x0000000004D10000-memory.dmp

Filesize
256KB

Download
memory/3044-5-0x00000000011E0000-0x0000000001238000-memory.dmp

Filesize
352KB

Download
memory/3044-9-0x00000000004D0000-0x00000000004FC000-memory.dmp

Filesize
176KB

Download
memory/3044-8-0x0000000000310000-0x0000000000318000-memory.dmp

Filesize
32KB

Download
memory/3044-29-0x0000000074420000-0x0000000074B0E000-memory.dmp

Filesize
6.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

Replay Monitor

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