xloader | 3e4f71deec4d7f09a2b1d3d842f333c1a5b74b01586de7d4373c1b471268844f

General

Target

PO_200251-269312.js
Size

363KB
MD5

44caad4df8dbf71425f53a4164300228
SHA1

bcbb189276805f815d92575e026ee95c59c2a772
SHA256

3580439625a85986a0a0428e95a2c22b246c509e340082c3c03e24abc997c9d5
SHA512

309ca938b4050518afe95b9b8c44c550ecfb6cdea5bea8d8ed7c42d302808bd78efb2ea0338f9f73442dde44ca0acb5702848b97f56183cde2e38516726f769c

Score

10^/10

xloader vs8g loader persistence rat suricata

Malware Config

Extracted

Family

xloader

Version

2.9

Campaign

vs8g

Decoy

xEVEsySadSMf8UUC

H8ZbYtGKWPCfp91+uS3TFo/F7tYacwDqHw==

L/St5UjIhTMzEHsb

8h8tDvq0nl8JCWoagxa0MVyvnA==

7bml44z9jZsZx8Co2T8=

EwH88ZtcOu8ehs2P2o6wv78FEe4+xRQ=

bTn3LpE1HfpPAXI=

nYxT+9GLhS1d3zzGJuTDlgpT

HxonIwh8TesenMCo2T8=

Ki83MiehhC9e1i7YQ/Wd32JsGcun

wHcUByFRMuEGh8Co2T8=

86tqpg/Jy60eFmMRPefDlgpT

grSUYa5yahUf8UUC

HVviVsk7Cb6Elc571pnSWCJ93G17PkiI

6LJ1qBPUtGNIl8Co2T8=

AYuWD33xt44VxsCo2T8=

/smXvLMh868VzQqs99/DlgpT

1kEMNVtaMw6KmN+YANYm+kA=

daarti3nbFVKnsCo2T8=

0EJM6cFFHvawA2U=

Signatures

Xloader
Xloader is a rebranded version of Formbook malware.
loader xloader
suricata: ET MALWARE FormBook CnC Checkin (GET)
suricata: ET MALWARE FormBook CnC Checkin (GET)
suricata

Xloader payload 6 IoCs

rat

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\bin.exe	xloader
behavioral1/memory/1952-64-0x0000000000080000-0x00000000000AC000-memory.dmp	xloader
C:\Users\Admin\AppData\Local\Temp\bin.exe	xloader
behavioral1/memory/1952-70-0x0000000000080000-0x00000000000AC000-memory.dmp	xloader
C:\Program Files (x86)\U-z4\chkdsk1b0dit2.exe	xloader
C:\Program Files (x86)\U-z4\chkdsk1b0dit2.exe	xloader

Adds policy Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

chkdsk.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	chkdsk.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\HNUXN448_6- = "C:\\Program Files (x86)\\U-z4\\chkdsk1b0dit2.exe"	chkdsk.exe

Executes dropped EXE 2 IoCs

Processes:

bin.exechkdsk1b0dit2.exe

pid process

1940 bin.exe
1108 chkdsk1b0dit2.exe
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

Processes:

bin.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Control Panel\International\Geo\Nation bin.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Control Panel\International\Geo\Nation	bin.exe

Suspicious use of SetThreadContext 2 IoCs

Processes:

bin.exechkdsk.exe

description	pid	process	target process
PID 1940 set thread context of 1428	1940	bin.exe	Explorer.EXE
PID 1952 set thread context of 1428	1952	chkdsk.exe	Explorer.EXE

Drops file in Program Files directory 2 IoCs

Processes:

Explorer.EXEchkdsk.exe

description	ioc	process
File created	C:\Program Files (x86)\U-z4\chkdsk1b0dit2.exe	Explorer.EXE
File opened for modification	C:\Program Files (x86)\U-z4\chkdsk1b0dit2.exe	chkdsk.exe

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

System Information Discovery
T1082
Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry
T1012

System Information Discovery
T1082

Processes:

chkdsk.exe

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier chkdsk.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier	chkdsk.exe

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

Processes:

chkdsk.exe

description	ioc	process
Key created	\Registry\User\S-1-5-21-1819626980-2277161760-1023733287-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	chkdsk.exe

Suspicious behavior: EnumeratesProcesses 27 IoCs

Processes:

bin.exechkdsk.exechkdsk1b0dit2.exe

pid	process
1940	bin.exe
1940	bin.exe
1952	chkdsk.exe
1952	chkdsk.exe
1952	chkdsk.exe
1952	chkdsk.exe
1952	chkdsk.exe
1952	chkdsk.exe
1952	chkdsk.exe
1952	chkdsk.exe
1952	chkdsk.exe
1952	chkdsk.exe
1952	chkdsk.exe
1952	chkdsk.exe
1952	chkdsk.exe
1952	chkdsk.exe
1952	chkdsk.exe
1952	chkdsk.exe
1952	chkdsk.exe
1952	chkdsk.exe
1952	chkdsk.exe
1952	chkdsk.exe
1952	chkdsk.exe
1952	chkdsk.exe
1108	chkdsk1b0dit2.exe
1952	chkdsk.exe
1952	chkdsk.exe

Suspicious behavior: MapViewOfSection 7 IoCs

Processes:

bin.exechkdsk.exe

pid process

1940 bin.exe
1940 bin.exe
1940 bin.exe
1952 chkdsk.exe
1952 chkdsk.exe
1952 chkdsk.exe
1952 chkdsk.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

bin.exechkdsk.exechkdsk1b0dit2.exe

description pid process

Token: SeDebugPrivilege 1940 bin.exe
Token: SeDebugPrivilege 1952 chkdsk.exe
Token: SeDebugPrivilege 1108 chkdsk1b0dit2.exe
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

Explorer.EXE

pid process

1428 Explorer.EXE
1428 Explorer.EXE
Suspicious use of SendNotifyMessage 2 IoCs

Processes:

Explorer.EXE

pid process

1428 Explorer.EXE
1428 Explorer.EXE

description	pid	process
Token: SeDebugPrivilege	1940	bin.exe
Token: SeDebugPrivilege	1952	chkdsk.exe
Token: SeDebugPrivilege	1108	chkdsk1b0dit2.exe

pid	process
1428	Explorer.EXE
1428	Explorer.EXE

pid	process
1428	Explorer.EXE
1428	Explorer.EXE

Suspicious use of WriteProcessMemory 24 IoCs

Processes:

wscript.exeExplorer.EXEchkdsk.exe

description	pid	process	target process
PID 1504 wrote to memory of 940	1504	wscript.exe	wscript.exe
PID 1504 wrote to memory of 940	1504	wscript.exe	wscript.exe
PID 1504 wrote to memory of 940	1504	wscript.exe	wscript.exe
PID 1504 wrote to memory of 1940	1504	wscript.exe	bin.exe
PID 1504 wrote to memory of 1940	1504	wscript.exe	bin.exe
PID 1504 wrote to memory of 1940	1504	wscript.exe	bin.exe
PID 1504 wrote to memory of 1940	1504	wscript.exe	bin.exe
PID 1428 wrote to memory of 1952	1428	Explorer.EXE	chkdsk.exe
PID 1428 wrote to memory of 1952	1428	Explorer.EXE	chkdsk.exe
PID 1428 wrote to memory of 1952	1428	Explorer.EXE	chkdsk.exe
PID 1428 wrote to memory of 1952	1428	Explorer.EXE	chkdsk.exe
PID 1952 wrote to memory of 1724	1952	chkdsk.exe	cmd.exe
PID 1952 wrote to memory of 1724	1952	chkdsk.exe	cmd.exe
PID 1952 wrote to memory of 1724	1952	chkdsk.exe	cmd.exe
PID 1952 wrote to memory of 1724	1952	chkdsk.exe	cmd.exe
PID 1952 wrote to memory of 1900	1952	chkdsk.exe	Firefox.exe
PID 1952 wrote to memory of 1900	1952	chkdsk.exe	Firefox.exe
PID 1952 wrote to memory of 1900	1952	chkdsk.exe	Firefox.exe
PID 1952 wrote to memory of 1900	1952	chkdsk.exe	Firefox.exe
PID 1952 wrote to memory of 1900	1952	chkdsk.exe	Firefox.exe
PID 1428 wrote to memory of 1108	1428	Explorer.EXE	chkdsk1b0dit2.exe
PID 1428 wrote to memory of 1108	1428	Explorer.EXE	chkdsk1b0dit2.exe
PID 1428 wrote to memory of 1108	1428	Explorer.EXE	chkdsk1b0dit2.exe
PID 1428 wrote to memory of 1108	1428	Explorer.EXE	chkdsk1b0dit2.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Drops file in Program Files directory
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1428

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\PO_200251-269312.js
2⤵
- Suspicious use of WriteProcessMemory
PID:1504

C:\Windows\System32\wscript.exe
"C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\lohHCUyeTi.js"
3⤵
PID:940

C:\Users\Admin\AppData\Local\Temp\bin.exe
"C:\Users\Admin\AppData\Local\Temp\bin.exe"
3⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:1940

C:\Windows\SysWOW64\chkdsk.exe
"C:\Windows\SysWOW64\chkdsk.exe"
2⤵
- Adds policy Run key to start application
- Suspicious use of SetThreadContext
- Drops file in Program Files directory
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1952

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Admin\AppData\Local\Temp\bin.exe"
3⤵
PID:1724

C:\Program Files\Mozilla Firefox\Firefox.exe
"C:\Program Files\Mozilla Firefox\Firefox.exe"
3⤵
PID:1900

C:\Program Files (x86)\U-z4\chkdsk1b0dit2.exe
"C:\Program Files (x86)\U-z4\chkdsk1b0dit2.exe"
2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1108

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Program Files (x86)\U-z4\chkdsk1b0dit2.exe
Filesize
174KB

MD5
3ae87cd93196b3f86a2e1cfa3e6c9133

SHA1
64b444869181c8893d695072239bc48681ea10cd

SHA256
0a1b761095e129d76033c7bde535ca8f0517b4ddaaeda3981b5d8f998f8cf407

SHA512
1e1490502069ff5328939cc30a8e1aa74089e9cf918a27c0ce831c877035fe578811fcb970859c88437724c65383e86f055eedad4c14e3699d4270d280b865e8

Download Submit
C:\Program Files (x86)\U-z4\chkdsk1b0dit2.exe
Filesize
174KB

MD5
3ae87cd93196b3f86a2e1cfa3e6c9133

SHA1
64b444869181c8893d695072239bc48681ea10cd

SHA256
0a1b761095e129d76033c7bde535ca8f0517b4ddaaeda3981b5d8f998f8cf407

SHA512
1e1490502069ff5328939cc30a8e1aa74089e9cf918a27c0ce831c877035fe578811fcb970859c88437724c65383e86f055eedad4c14e3699d4270d280b865e8

Download Submit
C:\Users\Admin\AppData\Local\Temp\bin.exe
Filesize
174KB

MD5
3ae87cd93196b3f86a2e1cfa3e6c9133

SHA1
64b444869181c8893d695072239bc48681ea10cd

SHA256
0a1b761095e129d76033c7bde535ca8f0517b4ddaaeda3981b5d8f998f8cf407

SHA512
1e1490502069ff5328939cc30a8e1aa74089e9cf918a27c0ce831c877035fe578811fcb970859c88437724c65383e86f055eedad4c14e3699d4270d280b865e8

Download Submit
C:\Users\Admin\AppData\Local\Temp\bin.exe
Filesize
174KB

MD5
3ae87cd93196b3f86a2e1cfa3e6c9133

SHA1
64b444869181c8893d695072239bc48681ea10cd

SHA256
0a1b761095e129d76033c7bde535ca8f0517b4ddaaeda3981b5d8f998f8cf407

SHA512
1e1490502069ff5328939cc30a8e1aa74089e9cf918a27c0ce831c877035fe578811fcb970859c88437724c65383e86f055eedad4c14e3699d4270d280b865e8

Download Submit
C:\Users\Admin\AppData\Roaming\lohHCUyeTi.js
Filesize
18KB

MD5
1077d1287ae4722779016583ec528af6

SHA1
efe686cc0d611655b03097d7e3d1c60f402d49b6

SHA256
d22b5b17c854ef3f740aff315986b82ed3859c39231defc56b02a52ce860058e

SHA512
9d69511790ab530179c82e598c892e75a58ac3407453163f9bbbd17a103b9790b7df8a44f71a523a4fea25003a9bbdb95a89d724d0d126edc619858cdf96b462

Download Submit
memory/940-55-0x0000000000000000-mapping.dmp

Download
memory/1108-75-0x00000000008B0000-0x0000000000BB3000-memory.dmp

Filesize
3.0MB

Download
memory/1108-73-0x0000000000000000-mapping.dmp

Download
memory/1428-61-0x00000000067A0000-0x00000000068AB000-memory.dmp

Filesize
1.0MB

Download
memory/1428-69-0x00000000069A0000-0x0000000006A62000-memory.dmp

Filesize
776KB

Download
memory/1428-71-0x00000000069A0000-0x0000000006A62000-memory.dmp

Filesize
776KB

Download
memory/1504-54-0x000007FEFB9F1000-0x000007FEFB9F3000-memory.dmp

Filesize
8KB

Download
memory/1724-66-0x0000000000000000-mapping.dmp

Download
memory/1940-59-0x0000000000840000-0x0000000000B43000-memory.dmp

Filesize
3.0MB

Download
memory/1940-60-0x0000000000280000-0x0000000000291000-memory.dmp

Filesize
68KB

Download
memory/1940-57-0x0000000000000000-mapping.dmp

Download
memory/1952-68-0x0000000000980000-0x0000000000A10000-memory.dmp

Filesize
576KB

Download
memory/1952-67-0x0000000000B10000-0x0000000000E13000-memory.dmp

Filesize
3.0MB

Download
memory/1952-70-0x0000000000080000-0x00000000000AC000-memory.dmp

Filesize
176KB

Download
memory/1952-64-0x0000000000080000-0x00000000000AC000-memory.dmp

Filesize
176KB

Download
memory/1952-72-0x0000000075271000-0x0000000075273000-memory.dmp

Filesize
8KB

Download
memory/1952-63-0x0000000000F40000-0x0000000000F47000-memory.dmp

Filesize
28KB

Download
memory/1952-62-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

Loading Replay Monitor...

Downloads