xloader | a92f8917b2e98217ede5359f7906dd0a60df26e087a1e1c33b81797a334fb448

Analysis

max time kernel
150s
max time network
152s
platform
windows7_x64
resource
win7-20220414-en
submitted
21/06/2022, 10:20

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General

Target
bis.exe
Size 451KB
Sample220621-mc4ccsfbf2
SHA256 a92f8917b2e98217ede5359f7906dd0a60df26e087a1e1c33b81797a334fb448
MD5 9e1bb80ff1f6f5181ed26c62ef3de29d
SHA1 5c37096275b5947dfd68ccacc92eec204fa73883
SHA512 f1493090882bbe106508b50a0dcc8ac9966b157837f3d3d428b5b1977bcda3ea00eb067b5f925add5a38e069cfb4e7ce63be49ba8db29b23eb171290226e7004
MD5 SHA1 SHA512

Score

10^/10

xloader rb1k loader persistence rat suricata

Malware Config

Extracted

Family

xloader

Version

Campaign

rb1k

Decoy

Hy3kKk3exSb8BwggZ6MfKxQ=
NCL+/Dy1jhSUG9mRm0U=
wWOomCbzt4pHcH22F16ZDMRcKw==
WTIg8VQo+NeSJsTaLk6M9XQi
GxTnP34PxKGMqI0aDg==
BCLmUMWYgpQ0hmDGRvcILQM=
ILk0ukAA71UFWNrW
aHq3rPmIgJpVF+C9GQ==
8jYg+GYnGycf+ufa9Fo=
gQpOLax1ZUbL5at4u1SkP/XMaS0=
s1abd4QIyia5Ta6zEUSM9XQi
JDL1dr1IE+a1q4zB
24b2gBbkpvG81Nh1rLjxJw==
U5KEePzSsY5a/WYuVdUXnycmbPcnk6RB
D+TYrgrRwtaL5YIUEQ==
T1gpjLMr70QZODL8/UOM9XQi
f3Efb+StKpP+MQ==
fUfDKVLlzfcCFgo=
23rI2NitbuCL
ypQDXuCwKpP+MQ==
HAb9/o1eLLQ9wSTfYYSH
dGQztBqhddBmAXhBXcxKFgs=
pot/UnwB2u3ASrJxrLjxJw==
u0T+cxPYr0QFWNrW
Xd4g6AvWeAiHFNmRm0U=
fqY0SI2eZ8o=
8drNzC++V3AVf2DUYR5ZxjZMexa6qwY=
nbJ3+p1pTrKCkI2W2WKmP/XMaS0=
2hALD5uTJQmW5YIUEQ==
xkOFeq85DZta4TTHqkaTsKRHWhWYuw==
oM7LtPFwVWgDawjY9lo=
I6fZxC063kHYasfIFUSM9XQi
3tSd2b+SQYRPWh4=
iQKA+Xs4IpIluCPfYYSH
WZeQeI4b9FYFWNrW
j4Etp+CtbuCL
wWGZaYoV9XsDjMeSwzZ1tqK0WhWYuw==
EmloL1XbangEJg==
yU6IU27/+OCqK5mc+D5pZzEXvksf
WZKSas6qakwYQB4bZaMfKxQ=
bPxAU5ReCj/E6Bmu2VI=
IOZn4Wky9gf+nyfw+Fo=
il/DFi65d1XWM96z2FA=
RtQFCV/SvsqI5YIUEQ==
n3sLWHwMx6QhefHiBg==
s1fVFTG+gQnLhOzE8nq9EMFmMg==
x6iSiQrLangEJg==
czynGrjNeuqB
96wda7Yz/9qL5YIUEQ==
cMAlpBKfasZ0knE2aKMfKxQ=
+b49sNMNangEJg==
ynKneOyojnL+HxwufAhbGocyQO8nk6RB
hsy9q0Ig6o7J5YIUEQ==
49iq9i7AWSj7EvjE9T/yIQ0=
sYxAhPrIi2QqnRrfYYSH
DAo7NXv96UD+qCnt+0SM9XQi
69TZxSrz4MxfcllPdaMfKxQ=
wIryVHQR+gzPXPIBWoh3DHEKLW0nk6RB
L6TuDuPkKpP+MQ==
S6Vr07qsKn06Pw==
fbiiiwzOangEJg==
CcAzujb9ytZvk5qm7D/yIQ0=
tAsA5EU4mfcCFgo=
0knRgKY39EwFWNrW
strictlynightowl.com

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 5 IoCs

rat

resource	yara_rule
behavioral1/memory/1328-62-0x0000000000400000-0x000000000042C000-memory.dmp	xloader
behavioral1/memory/1328-63-0x000000000041F6C0-mapping.dmp	xloader
behavioral1/memory/1328-65-0x0000000000400000-0x000000000042C000-memory.dmp	xloader
behavioral1/memory/936-73-0x0000000000080000-0x00000000000AC000-memory.dmp	xloader
behavioral1/memory/936-76-0x0000000000080000-0x00000000000AC000-memory.dmp	xloader

Adds policy Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	help.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\DTXDDXWH5T0 = "C:\\Program Files (x86)\\Lwfylpf\\updateojshll20.exe"	help.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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Control Panel\International\Geo\Nation	bis.exe

Deletes itself 1 IoCs

pid	Process
1960	cmd.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1948 set thread context of 1328	1948	bis.exe	29
PID 1328 set thread context of 1256	1328	bis.exe	14
PID 936 set thread context of 1256	936	help.exe	14

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Lwfylpf\updateojshll20.exe	help.exe

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\Registry\User\S-1-5-21-2277218442-1199762539-2004043321-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	help.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
1948	bis.exe
1328	bis.exe
1328	bis.exe
936	help.exe
936	help.exe
936	help.exe
936	help.exe
936	help.exe
936	help.exe
936	help.exe
936	help.exe
936	help.exe
936	help.exe
936	help.exe
936	help.exe
936	help.exe
936	help.exe
936	help.exe
936	help.exe

Suspicious behavior: MapViewOfSection 7 IoCs

pid	Process
1328	bis.exe
1328	bis.exe
1328	bis.exe
936	help.exe
936	help.exe
936	help.exe
936	help.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1948	bis.exe
Token: SeDebugPrivilege	1328	bis.exe
Token: SeDebugPrivilege	936	help.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
1256	Explorer.EXE
1256	Explorer.EXE

Suspicious use of SendNotifyMessage 2 IoCs

pid	Process
1256	Explorer.EXE
1256	Explorer.EXE

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 1948 wrote to memory of 1160	1948	bis.exe	28
PID 1948 wrote to memory of 1160	1948	bis.exe	28
PID 1948 wrote to memory of 1160	1948	bis.exe	28
PID 1948 wrote to memory of 1160	1948	bis.exe	28
PID 1948 wrote to memory of 1328	1948	bis.exe	29
PID 1948 wrote to memory of 1328	1948	bis.exe	29
PID 1948 wrote to memory of 1328	1948	bis.exe	29
PID 1948 wrote to memory of 1328	1948	bis.exe	29
PID 1948 wrote to memory of 1328	1948	bis.exe	29
PID 1948 wrote to memory of 1328	1948	bis.exe	29
PID 1948 wrote to memory of 1328	1948	bis.exe	29
PID 1256 wrote to memory of 936	1256	Explorer.EXE	30
PID 1256 wrote to memory of 936	1256	Explorer.EXE	30
PID 1256 wrote to memory of 936	1256	Explorer.EXE	30
PID 1256 wrote to memory of 936	1256	Explorer.EXE	30
PID 936 wrote to memory of 1960	936	help.exe	31
PID 936 wrote to memory of 1960	936	help.exe	31
PID 936 wrote to memory of 1960	936	help.exe	31
PID 936 wrote to memory of 1960	936	help.exe	31
PID 936 wrote to memory of 1976	936	help.exe	34
PID 936 wrote to memory of 1976	936	help.exe	34
PID 936 wrote to memory of 1976	936	help.exe	34
PID 936 wrote to memory of 1976	936	help.exe	34
PID 936 wrote to memory of 1976	936	help.exe	34

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1256
- C:\Users\Admin\AppData\Local\Temp\bis.exe
  "C:\Users\Admin\AppData\Local\Temp\bis.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1948
- - C:\Users\Admin\AppData\Local\Temp\bis.exe
    "C:\Users\Admin\AppData\Local\Temp\bis.exe"
    3⤵
    PID:1160
- - C:\Users\Admin\AppData\Local\Temp\bis.exe
    "C:\Users\Admin\AppData\Local\Temp\bis.exe"
    3⤵
    - Checks computer location settings
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of AdjustPrivilegeToken
    PID:1328
- C:\Windows\SysWOW64\help.exe
  "C:\Windows\SysWOW64\help.exe"
  2⤵
  - Adds policy Run key to start application
  - Suspicious use of SetThreadContext
  - Drops file in Program Files directory
  - Modifies Internet Explorer settings
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:936
- - C:\Windows\SysWOW64\cmd.exe
    /c del "C:\Users\Admin\AppData\Local\Temp\bis.exe"
    3⤵
    - Deletes itself
    PID:1960
- - C:\Program Files\Mozilla Firefox\Firefox.exe
    "C:\Program Files\Mozilla Firefox\Firefox.exe"
    3⤵
    PID:1976

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/936-76-0x0000000000080000-0x00000000000AC000-memory.dmp

Download

memory/936-74-0x0000000000470000-0x0000000000500000-memory.dmp

Download

memory/936-73-0x0000000000080000-0x00000000000AC000-memory.dmp

Download

memory/936-72-0x0000000000860000-0x0000000000B63000-memory.dmp

Download

memory/936-71-0x0000000000FD0000-0x0000000000FD6000-memory.dmp

Download

memory/1256-68-0x0000000006D00000-0x0000000006E81000-memory.dmp

Download

memory/1256-77-0x0000000004320000-0x000000000440A000-memory.dmp

Download

memory/1256-75-0x0000000004320000-0x000000000440A000-memory.dmp

Download

memory/1328-59-0x0000000000400000-0x000000000042C000-memory.dmp

Download

memory/1328-66-0x0000000000C80000-0x0000000000F83000-memory.dmp

Download

memory/1328-67-0x0000000000130000-0x0000000000141000-memory.dmp

Download

memory/1328-65-0x0000000000400000-0x000000000042C000-memory.dmp

Download

memory/1328-62-0x0000000000400000-0x000000000042C000-memory.dmp

Download

memory/1328-60-0x0000000000400000-0x000000000042C000-memory.dmp

Download

memory/1948-54-0x0000000000C00000-0x0000000000C78000-memory.dmp

Download

memory/1948-58-0x0000000000510000-0x0000000000542000-memory.dmp

Download

memory/1948-57-0x0000000004F50000-0x0000000004FBA000-memory.dmp

Download

memory/1948-56-0x00000000002C0000-0x00000000002CE000-memory.dmp

Download

memory/1948-55-0x00000000754A1000-0x00000000754A3000-memory.dmp

Download