xloader | a92f8917b2e98217ede5359f7906dd0a60df26e087a1e1c33b81797a334fb448

Analysis

max time kernel
151s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20220414-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 spyware stealer 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
suricata: ET MALWARE FormBook CnC Checkin (POST) M2
suricata: ET MALWARE FormBook CnC Checkin (POST) M2
suricata

Xloader Payload 4 IoCs

rat

resource	yara_rule
behavioral2/memory/2544-136-0x0000000000400000-0x000000000042C000-memory.dmp	xloader
behavioral2/memory/2544-138-0x0000000000400000-0x000000000042C000-memory.dmp	xloader
behavioral2/memory/2328-145-0x0000000000E50000-0x0000000000E7C000-memory.dmp	xloader
behavioral2/memory/2328-149-0x0000000000E50000-0x0000000000E7C000-memory.dmp	xloader

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-1-5-21-1081944012-3634099177-1681222835-1000\Control Panel\International\Geo\Nation	bis.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Adds 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\WOW6432Node\Microsoft\Windows\CurrentVersion\Run	mstsc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\DXP01NUXLXD = "C:\\Program Files (x86)\\Yevu\\9rkl_clttq0.exe"	mstsc.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2276 set thread context of 2544	2276	bis.exe	91
PID 2544 set thread context of 2044	2544	bis.exe	40
PID 2328 set thread context of 2044	2328	mstsc.exe	40

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Yevu\9rkl_clttq0.exe	mstsc.exe

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\Registry\User\S-1-5-21-1081944012-3634099177-1681222835-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	mstsc.exe

Suspicious behavior: EnumeratesProcesses 36 IoCs

pid	Process
2544	bis.exe
2544	bis.exe
2544	bis.exe
2544	bis.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2044	Explorer.EXE

Suspicious behavior: MapViewOfSection 7 IoCs

pid	Process
2544	bis.exe
2544	bis.exe
2544	bis.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe
2328	mstsc.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2544	bis.exe
Token: SeDebugPrivilege	2328	mstsc.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2276 wrote to memory of 2544	2276	bis.exe	91
PID 2276 wrote to memory of 2544	2276	bis.exe	91
PID 2276 wrote to memory of 2544	2276	bis.exe	91
PID 2276 wrote to memory of 2544	2276	bis.exe	91
PID 2276 wrote to memory of 2544	2276	bis.exe	91
PID 2276 wrote to memory of 2544	2276	bis.exe	91
PID 2044 wrote to memory of 2328	2044	Explorer.EXE	92
PID 2044 wrote to memory of 2328	2044	Explorer.EXE	92
PID 2044 wrote to memory of 2328	2044	Explorer.EXE	92
PID 2328 wrote to memory of 4232	2328	mstsc.exe	93
PID 2328 wrote to memory of 4232	2328	mstsc.exe	93
PID 2328 wrote to memory of 4232	2328	mstsc.exe	93
PID 2328 wrote to memory of 1264	2328	mstsc.exe	95
PID 2328 wrote to memory of 1264	2328	mstsc.exe	95
PID 2328 wrote to memory of 1264	2328	mstsc.exe	95
PID 2328 wrote to memory of 3052	2328	mstsc.exe	97
PID 2328 wrote to memory of 3052	2328	mstsc.exe	97
PID 2328 wrote to memory of 3052	2328	mstsc.exe	97
PID 2328 wrote to memory of 1900	2328	mstsc.exe	99
PID 2328 wrote to memory of 1900	2328	mstsc.exe	99
PID 2328 wrote to memory of 1900	2328	mstsc.exe	99

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of WriteProcessMemory
PID:2044
- C:\Users\Admin\AppData\Local\Temp\bis.exe
  "C:\Users\Admin\AppData\Local\Temp\bis.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of WriteProcessMemory
  PID:2276
- - 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:2544
- C:\Windows\SysWOW64\mstsc.exe
  "C:\Windows\SysWOW64\mstsc.exe"
  2⤵
  - Adds 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:2328
- - C:\Windows\SysWOW64\cmd.exe
    /c del "C:\Users\Admin\AppData\Local\Temp\bis.exe"
    3⤵
    PID:4232
- - C:\Windows\SysWOW64\cmd.exe
    /c copy "C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Login Data" "C:\Users\Admin\AppData\Local\Temp\DB1" /V
    3⤵
    PID:1264
- - C:\Windows\SysWOW64\cmd.exe
    /c copy "C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Login Data" "C:\Users\Admin\AppData\Local\Temp\DB1" /V
    3⤵
    PID:3052
- - C:\Program Files\Mozilla Firefox\Firefox.exe
    "C:\Program Files\Mozilla Firefox\Firefox.exe"
    3⤵
    PID:1900

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

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

DB1

Path C:\Users\Admin\AppData\Local\Temp\DB1
Size 40KB
SHA256 b281ce54125d4250a80f48fcc02a8eea53f2c35c3b726e2512c3d493da0013bf
MD5 b608d407fc15adea97c26936bc6f03f6
SHA1 953e7420801c76393902c0d6bb56148947e41571
SHA512 cc96ddf4bf90d6aaa9d86803cb2aa30cd8e9b295aee1bd5544b88aeab63dc60bb1d4641e846c9771bab51aabbfbcd984c6d3ee83b96f5b65d09c0841d464b9e4
SSDEEP 48:2j3WBA+IIYICVEq8MX0D0HSFlNUK6lGNxGt7KLk8s8LKvUf9KVyJ7hU:u2FCn8MZyFlulGNxGt7KLyeymw
MD5 SHA1 SHA512 SSDEEP

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DB1

Path C:\Users\Admin\AppData\Local\Temp\DB1
Size 48KB
SHA256 c9fd7be4579e4aa942e8c2b44ab10115fa6c2fe6afd0c584865413d9d53f3b2a
MD5 349e6eb110e34a08924d92f6b334801d
SHA1 bdfb289daff51890cc71697b6322aa4b35ec9169
SHA512 2a635b815a5e117ea181ee79305ee1baf591459427acc5210d8c6c7e447be3513ead871c605eb3d32e4ab4111b2a335f26520d0ef8c1245a4af44e1faec44574
SSDEEP 96:uRMKLyeymwxCn8MZyFlSynlbiXyKwt8hG:uRkxGOXnlbibhG
MD5 SHA1 SHA512 SSDEEP

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memory/2044-141-0x0000000008AE0000-0x0000000008BD1000-memory.dmp

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memory/2044-150-0x0000000008BE0000-0x0000000008CF8000-memory.dmp

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memory/2044-148-0x0000000008BE0000-0x0000000008CF8000-memory.dmp

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memory/2276-134-0x00000000088F0000-0x000000000898C000-memory.dmp

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memory/2276-130-0x00000000002B0000-0x0000000000328000-memory.dmp

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memory/2276-133-0x0000000004D70000-0x0000000004D7A000-memory.dmp

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memory/2276-132-0x0000000004CD0000-0x0000000004D62000-memory.dmp

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memory/2276-131-0x00000000051E0000-0x0000000005784000-memory.dmp

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memory/2328-149-0x0000000000E50000-0x0000000000E7C000-memory.dmp

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memory/2328-144-0x0000000000680000-0x00000000007BA000-memory.dmp

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memory/2328-145-0x0000000000E50000-0x0000000000E7C000-memory.dmp

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memory/2328-146-0x0000000002D60000-0x00000000030AA000-memory.dmp

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memory/2328-147-0x0000000002BF0000-0x0000000002C80000-memory.dmp

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memory/2544-136-0x0000000000400000-0x000000000042C000-memory.dmp

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memory/2544-140-0x0000000001720000-0x0000000001731000-memory.dmp

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memory/2544-139-0x0000000001760000-0x0000000001AAA000-memory.dmp

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memory/2544-138-0x0000000000400000-0x000000000042C000-memory.dmp

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