floxif | 6455edf671362bff99424c329856d1c28b02ed39c45dad8cfa2fda18e9ae236c

General

Target

6455edf671362bff99424c329856d1c28b02ed39c45dad8cfa2fda18e9ae236c.exe
Size

558KB
MD5

39364ae4b3deed920bcfe9e893d73980
SHA1

3c762c7269bae09bb8340c6bfc5467c48a49c126
SHA256

6455edf671362bff99424c329856d1c28b02ed39c45dad8cfa2fda18e9ae236c
SHA512

1cfde0cc995b70added907388f687bfc9654ec27529a2c348e8692415b2ea8aaf0dacbd18e137e1758157d4bcb0d6de58ffc5472651f6df33163d9824a162186
SSDEEP

12288:D13ak/mBXTG4/1vN8KI7ZnMEF7nfJqmsvZQBSoBjvrEH7x:pak/mBXTV/RNnEF7fgFZ+DrEH7x

Score

10^/10

floxif remcos 09 enero backdoor discovery persistence privilege_escalation rat trojan upx

Malware Config

Extracted

Family

remcos

Botnet

09 ENERO

C2

bienvenidoperezlora.kozow.com:1880

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-4QLQ2T
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
take_screenshot_option
false
take_screenshot_time
5

Signatures

Floxif family
floxif
Floxif, Floodfix
Floxif aka FloodFix is a file-changing trojan and backdoor written in C++.
backdoor trojan floxif
Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Remcos family
remcos

Detects Floxif payload 1 IoCs

backdoor

resource	yara_rule
behavioral1/files/0x000b0000000120f6-1.dat	floxif

Event Triggered Execution: AppInit DLLs 1 TTPs
Adversaries may establish persistence and/or elevate privileges by executing malicious content triggered by AppInit DLLs loaded into processes.
persistence privilege_escalation

AppInit DLLs
T1546.010

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral1/files/0x000b0000000120f6-1.dat	acprotect

Loads dropped DLL 1 IoCs

pid	Process
2896	6455edf671362bff99424c329856d1c28b02ed39c45dad8cfa2fda18e9ae236c.exe

Enumerates connected drives 3 TTPs 1 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\e:	6455edf671362bff99424c329856d1c28b02ed39c45dad8cfa2fda18e9ae236c.exe

UPX packed file 8 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x000b0000000120f6-1.dat	upx
behavioral1/memory/2896-3-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/2896-13-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/2896-19-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/2896-25-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/2896-33-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/2896-39-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/2896-43-0x0000000010000000-0x0000000010030000-memory.dmp	upx

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\System\symsrv.dll	6455edf671362bff99424c329856d1c28b02ed39c45dad8cfa2fda18e9ae236c.exe
File created	\??\c:\program files\common files\system\symsrv.dll.000	6455edf671362bff99424c329856d1c28b02ed39c45dad8cfa2fda18e9ae236c.exe

System Location Discovery: System Language Discovery 1 TTPs 1 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	6455edf671362bff99424c329856d1c28b02ed39c45dad8cfa2fda18e9ae236c.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2896	6455edf671362bff99424c329856d1c28b02ed39c45dad8cfa2fda18e9ae236c.exe
2896	6455edf671362bff99424c329856d1c28b02ed39c45dad8cfa2fda18e9ae236c.exe
2896	6455edf671362bff99424c329856d1c28b02ed39c45dad8cfa2fda18e9ae236c.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2896	6455edf671362bff99424c329856d1c28b02ed39c45dad8cfa2fda18e9ae236c.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2896	6455edf671362bff99424c329856d1c28b02ed39c45dad8cfa2fda18e9ae236c.exe

C:\Users\Admin\AppData\Local\Temp\6455edf671362bff99424c329856d1c28b02ed39c45dad8cfa2fda18e9ae236c.exe
"C:\Users\Admin\AppData\Local\Temp\6455edf671362bff99424c329856d1c28b02ed39c45dad8cfa2fda18e9ae236c.exe"
1⤵
- Loads dropped DLL
- Enumerates connected drives
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
PID:2896

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Event Triggered Execution

1

T1546

AppInit DLLs

1

T1546.010

Privilege Escalation

Event Triggered Execution

1

T1546

AppInit DLLs

1

T1546.010

Defense Evasion

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

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:\Program Files\Common Files\System\symsrv.dll.000

Filesize
175B

MD5
1130c911bf5db4b8f7cf9b6f4b457623

SHA1
48e734c4bc1a8b5399bff4954e54b268bde9d54c

SHA256
eba08cc8182f379392a97f542b350ea0dbbe5e4009472f35af20e3d857eafdf1

SHA512
94e2511ef2c53494c2aff0960266491ffc0e54e75185427d1ccedae27c286992c754ca94cbb0c9ea36e3f04cd4eb7f032c551cf2d4b309f292906303f1a75fa0

Download Submit
C:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
d5c72c0e76514a81a2e82a70ce8ea905

SHA1
a70605ae089a27c9c6f2e8bb92ed6b50a170bf44

SHA256
930d82dc980550b7d252871812278d5f45e4acc6b02674827e324abbca96d967

SHA512
b690d33d86de2d1c0eb7b78e0505c92e517227269351686009e7f70e94869c04e0d42eda7b916c55bd8c4e2c5591d2a1a2df2b09be41066c12e5bf34291c3abe

Download Submit
\Program Files\Common Files\System\symsrv.dll

Filesize
67KB

MD5
7574cf2c64f35161ab1292e2f532aabf

SHA1
14ba3fa927a06224dfe587014299e834def4644f

SHA256
de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085

SHA512
4db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab

Download Submit
memory/2896-39-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2896-43-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2896-19-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2896-12-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2896-24-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2896-25-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2896-13-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2896-32-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2896-33-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2896-3-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2896-38-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2896-18-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2896-42-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2896-45-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2896-49-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2896-54-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2896-58-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2896-62-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2896-66-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2896-70-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2896-73-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download

Analysis

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