guloader | ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba

General

Target

ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe
Size

782KB
MD5

4198250ab9b371a88707e6f5885ad17b
SHA1

19204d4586ff59e83ccc974ddf5471690e47eaf1
SHA256

ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba
SHA512

737e445ea137224269e37e61b776f76db7704333c7f73c4bf7769521f3ca8563ebb30983111ae67eee4c9871b3a688cc9d7a3cfab370f59ebb84b18156408fb8
SSDEEP

12288:4GQBy+G5GCSd1eesm6abgGMwNUVPvHooksN:n5+Eq1yHwkvBN

Score

10^/10

guloader remcos benchao discovery downloader rat

Malware Config

Extracted

Family

remcos

Botnet

benchao

C2

tochisglobal.ddns.net:6426

Attributes

audio_folder
MicRecords
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-9R4HLX
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
take_screenshot_option
false
take_screenshot_time
5

Signatures

Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader
Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos

Loads dropped DLL 11 IoCs

pid	Process
3400	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe
3400	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe
3400	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe
3400	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe
3400	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe
3400	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe
3400	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe
3400	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe
3400	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe
3400	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe
3400	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\spankingerne\Vidnesbyrd.Syn106	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe
File created	C:\Windows\SysWOW64\Dogmefastes.lnk	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe
File opened for modification	C:\Windows\SysWOW64\Dogmefastes.lnk	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
3064	wab.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
3400	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe
3064	wab.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3400 set thread context of 3064	3400	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe	93

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\eudaemons.ini	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe

Drops file in Windows directory 4 IoCs

description	ioc	Process
File opened for modification	C:\Windows\resources\0409\Opkomlinge\undersluice.yed	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe
File opened for modification	C:\Windows\resources\lizis\seadromes.ett	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe
File opened for modification	C:\Windows\resources\sygelejet\devested.per	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe
File opened for modification	C:\Windows\totlafholdenhedens\Sagittaries.ini	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe

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	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wab.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3400	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3064	wab.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3400 wrote to memory of 3064	3400	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe	93
PID 3400 wrote to memory of 3064	3400	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe	93
PID 3400 wrote to memory of 3064	3400	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe	93
PID 3400 wrote to memory of 3064	3400	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe	93
PID 3400 wrote to memory of 3064	3400	ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe	93

C:\Users\Admin\AppData\Local\Temp\ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe
"C:\Users\Admin\AppData\Local\Temp\ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe"
1⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Program Files directory
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:3400
- C:\Program Files (x86)\windows mail\wab.exe
  "C:\Users\Admin\AppData\Local\Temp\ab4df763c5581670d4163462003abad97e8a309fa976fb0d840f44bdd17db7ba.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:3064

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

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
8df6859c07e3fdf35c837a97710f1ba3

SHA1
320376a65b9ac27271ad64f921f84e889c71e80e

SHA256
004d75831540ed9cddddd23336a2d0e5077176b95825bc800bad028247cae579

SHA512
c0df0ff1f601c3a5fe940d30bbedc1fbe0504da16111a88d4efbc4b6d3a72274cef292f8b8e370f51de754034de09f0545b31acce6bf831dba7c9cf6b4949bd4

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsd829F.tmp\LangDLL.dll

Filesize
5KB

MD5
f1e9eed02db3a822a7ddef0c724e5f1f

SHA1
65864992f5b6c79c5efbefb5b1354648a8a86709

SHA256
6dff504c6759c418c6635c9b25b8c91d0d9ef7787a3a93610d7670bb563c09df

SHA512
c22b64fff76b25cf53231b8636f07b361d95791c4646787ce7beac27ad6a0de88337dcceb25b5196f97c452dda72e2614647f51a8a18cb4d5228a82ed2e0780c

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsd829F.tmp\System.dll

Filesize
11KB

MD5
17ed1c86bd67e78ade4712be48a7d2bd

SHA1
1cc9fe86d6d6030b4dae45ecddce5907991c01a0

SHA256
bd046e6497b304e4ea4ab102cab2b1f94ce09bde0eebba4c59942a732679e4eb

SHA512
0cbed521e7d6d1f85977b3f7d3ca7ac34e1b5495b69fd8c7bfa1a846baf53b0ecd06fe1ad02a3599082ffacaf8c71a3bb4e32dec05f8e24859d736b828092cd5

Download Submit
C:\Users\Public\Pictures\Milliluxes.lnk

Filesize
982B

MD5
f88f4bc881d5809f3b5f7984756ebe4d

SHA1
c85d6b5bea15b03bca5efc33d8a8792bfe6a97a2

SHA256
a69540c307517828056b0c6e100525be34c89aaf95d1b830fb284a5f56177b75

SHA512
605f76dfe62b46c8afa820173e833da6538f9a66cd27ff00186b4ebdbbe6eb712afe6e9fbcc7fdb83bc18184774c11b4bcce35695887a61c4a99dbe53d650ebe

Download Submit
C:\Windows\SysWOW64\Dogmefastes.lnk

Filesize
1KB

MD5
7b7b2d4c83bb1706ab50356841652f92

SHA1
c109fa49a5f2f82cca0c401fdf397d6de760aee2

SHA256
9add9134c7f37a36c21eb31b13461bb8e94700fa94b5828e394d17312e002d06

SHA512
9837262faea7c421d457c316443892b7ea424ec70e719886145b1db4ab3797277cc9216718b12231025706ee9f9201b679c913a93f7e73d74de1edf958d4afd3

Download Submit
memory/3064-657-0x0000000000B60000-0x0000000001DB4000-memory.dmp

Filesize
18.3MB

Download
memory/3064-644-0x0000000000B60000-0x0000000001DB4000-memory.dmp

Filesize
18.3MB

Download
memory/3064-681-0x0000000000B60000-0x0000000001DB4000-memory.dmp

Filesize
18.3MB

Download
memory/3064-678-0x0000000000B60000-0x0000000001DB4000-memory.dmp

Filesize
18.3MB

Download
memory/3064-638-0x0000000001DC0000-0x0000000004019000-memory.dmp

Filesize
34.3MB

Download
memory/3064-639-0x0000000000B60000-0x0000000001DB4000-memory.dmp

Filesize
18.3MB

Download
memory/3064-675-0x0000000000B60000-0x0000000001DB4000-memory.dmp

Filesize
18.3MB

Download
memory/3064-666-0x0000000000B60000-0x0000000001DB4000-memory.dmp

Filesize
18.3MB

Download
memory/3064-645-0x0000000001DC0000-0x0000000004019000-memory.dmp

Filesize
34.3MB

Download
memory/3064-648-0x0000000000B60000-0x0000000001DB4000-memory.dmp

Filesize
18.3MB

Download
memory/3064-651-0x0000000000B60000-0x0000000001DB4000-memory.dmp

Filesize
18.3MB

Download
memory/3064-672-0x0000000000B60000-0x0000000001DB4000-memory.dmp

Filesize
18.3MB

Download
memory/3064-654-0x0000000000B60000-0x0000000001DB4000-memory.dmp

Filesize
18.3MB

Download
memory/3064-669-0x0000000000B60000-0x0000000001DB4000-memory.dmp

Filesize
18.3MB

Download
memory/3064-660-0x0000000000B60000-0x0000000001DB4000-memory.dmp

Filesize
18.3MB

Download
memory/3064-663-0x0000000000B60000-0x0000000001DB4000-memory.dmp

Filesize
18.3MB

Download
memory/3400-643-0x0000000005000000-0x0000000007259000-memory.dmp

Filesize
34.3MB

Download
memory/3400-633-0x0000000005000000-0x0000000007259000-memory.dmp

Filesize
34.3MB

Download
memory/3400-634-0x0000000005000000-0x0000000007259000-memory.dmp

Filesize
34.3MB

Download
memory/3400-635-0x00000000775C1000-0x00000000776E1000-memory.dmp

Filesize
1.1MB

Download
memory/3400-637-0x0000000010004000-0x0000000010005000-memory.dmp

Filesize
4KB

Download
memory/3400-636-0x00000000775C1000-0x00000000776E1000-memory.dmp

Filesize
1.1MB

Download

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