formbook | c041a06efb25eff8fe0ef8ec1b43b3828ad4c3489827add8e156d7a2ec2a786e

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
21/12/2022, 10:40

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General

Target

Attachment.js
Size

1.1MB
MD5

f6291775008f71c57a810fb5803328d7
SHA1

a8135b5c3e14002e35188f3cc5dd9e00dff21552
SHA256

c041a06efb25eff8fe0ef8ec1b43b3828ad4c3489827add8e156d7a2ec2a786e
SHA512

145606f3c434c5bdc2db38cf18ffdb359454cd973ff11158433a8955a845499f3a9b99f95664767e86efb75268cdea9f586fb7d9ebb64ef22c29e6fb5afed291
SSDEEP

12288:GtHYDeDuDLzi5Z96Svb/nYsv/ysXEizfPxuGYjSHOL08+t2gI5tx/gHtBbtj97eG:YaSDnYsv/ysXEizf5uquL4U96RN

Score

10^/10

formbook vjw0rm ermr persistence rat spyware stealer trojan worm

Malware Config

Extracted

Family

formbook

Campaign

ermr

Decoy

ErOK6LFCgNIAlQmH54oaYOL/CN29Z78=

qNSdDhu/PT/1fgafDagiCSZH1SY=

wLpPOAkYS8EABl3pHGc4hNT/Q1sHBrU=

jSxRvptHkeTGl7PT0SEmaZmjqzanuA==

b91oL+2wCcpyhnd6yvF6Pg==

mr81yp1/qqZX

hy7Xsz/PU/LWHMcGL4UYJx9n3A==

KlwrHt1gouPaXaWhoQ==

ng8M320IRJL9Ptw=

8GQbOXuaWxvKnNM=

XndOL7E5sNpVUNty4d/a

rryPBBC8PybYb+2h2MF3FHGL

kEoeyERSVCYO0g==

5/P+SBDby5hO

1fYXc30/h9W7iO17

34X+YKR+wRFE

8ir/X2MlVByh5lQ1ow8=

u9ikm2UMZ7J7hpCYow==

FLI+c3clp1BNDjVAfvC2Dnw=

t21Erq8/r09wAzAJTAH3Ng==

Signatures

Formbook
Formbook is a data stealing malware which is capable of stealing data.
trojan spyware stealer formbook
Vjw0rm
Vjw0rm is a remote access trojan written in JavaScript.
trojan worm vjw0rm

Blocklisted process makes network request 17 IoCs

flow	pid	Process
6	3360	wscript.exe
14	3360	wscript.exe
17	3360	wscript.exe
23	3360	wscript.exe
32	3360	wscript.exe
36	3360	wscript.exe
45	3360	wscript.exe
48	3360	wscript.exe
49	3360	wscript.exe
51	1620	rundll32.exe
52	3360	wscript.exe
58	3360	wscript.exe
61	3360	wscript.exe
66	3360	wscript.exe
69	3360	wscript.exe
70	3360	wscript.exe
74	3360	wscript.exe

Executes dropped EXE 2 IoCs

pid	Process
2696	bin (1).exe
2216	7n7ls8dktw.exe

Checks computer location settings 2 TTPs 2 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-1-5-21-2971393436-602173351-1645505021-1000\Control Panel\International\Geo\Nation	bin (1).exe
Key value queried	\REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\Control Panel\International\Geo\Nation	wscript.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\UdTkVakXFj.js	wscript.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\UdTkVakXFj.js	wscript.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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\LDFLV4EH4X = "C:\\Program Files (x86)\\Ai6et6t18\\7n7ls8dktw.exe"	rundll32.exe
Key created	\Registry\Machine\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run	rundll32.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2696 set thread context of 668	2696	bin (1).exe	54
PID 1620 set thread context of 668	1620	rundll32.exe	54

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Ai6et6t18	Explorer.EXE
File created	C:\Program Files (x86)\Ai6et6t18\7n7ls8dktw.exe	Explorer.EXE
File opened for modification	C:\Program Files (x86)\Ai6et6t18\7n7ls8dktw.exe	Explorer.EXE
File opened for modification	C:\Program Files (x86)\Ai6et6t18\7n7ls8dktw.exe	rundll32.exe

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

System Information Discovery
T1082

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\Registry\User\S-1-5-21-2971393436-602173351-1645505021-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	rundll32.exe

Suspicious behavior: EnumeratesProcesses 62 IoCs

pid	Process
2696	bin (1).exe
2696	bin (1).exe
2696	bin (1).exe
2696	bin (1).exe
2696	bin (1).exe
2696	bin (1).exe
2696	bin (1).exe
2696	bin (1).exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
2216	7n7ls8dktw.exe
2216	7n7ls8dktw.exe
1620	rundll32.exe
1620	rundll32.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
668	Explorer.EXE

Suspicious behavior: MapViewOfSection 7 IoCs

pid	Process
2696	bin (1).exe
2696	bin (1).exe
2696	bin (1).exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe
1620	rundll32.exe

Suspicious use of AdjustPrivilegeToken 11 IoCs

description	pid	Process
Token: SeDebugPrivilege	2696	bin (1).exe
Token: SeDebugPrivilege	1620	rundll32.exe
Token: SeShutdownPrivilege	668	Explorer.EXE
Token: SeCreatePagefilePrivilege	668	Explorer.EXE
Token: SeShutdownPrivilege	668	Explorer.EXE
Token: SeCreatePagefilePrivilege	668	Explorer.EXE
Token: SeDebugPrivilege	2216	7n7ls8dktw.exe
Token: SeShutdownPrivilege	668	Explorer.EXE
Token: SeCreatePagefilePrivilege	668	Explorer.EXE
Token: SeShutdownPrivilege	668	Explorer.EXE
Token: SeCreatePagefilePrivilege	668	Explorer.EXE

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 3112 wrote to memory of 3360	3112	wscript.exe	81
PID 3112 wrote to memory of 3360	3112	wscript.exe	81
PID 3112 wrote to memory of 2696	3112	wscript.exe	82
PID 3112 wrote to memory of 2696	3112	wscript.exe	82
PID 3112 wrote to memory of 2696	3112	wscript.exe	82
PID 668 wrote to memory of 1620	668	Explorer.EXE	83
PID 668 wrote to memory of 1620	668	Explorer.EXE	83
PID 668 wrote to memory of 1620	668	Explorer.EXE	83
PID 1620 wrote to memory of 332	1620	rundll32.exe	87
PID 1620 wrote to memory of 332	1620	rundll32.exe	87
PID 1620 wrote to memory of 332	1620	rundll32.exe	87
PID 1620 wrote to memory of 4836	1620	rundll32.exe	93
PID 1620 wrote to memory of 4836	1620	rundll32.exe	93
PID 1620 wrote to memory of 4836	1620	rundll32.exe	93
PID 668 wrote to memory of 2216	668	Explorer.EXE	94
PID 668 wrote to memory of 2216	668	Explorer.EXE	94
PID 668 wrote to memory of 2216	668	Explorer.EXE	94

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Drops file in Program Files directory
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:668
- C:\Windows\system32\wscript.exe
  wscript.exe C:\Users\Admin\AppData\Local\Temp\Attachment.js
  2⤵
  - Checks computer location settings
  - Suspicious use of WriteProcessMemory
  PID:3112
- - C:\Windows\System32\wscript.exe
    "C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\UdTkVakXFj.js"
    3⤵
    - Blocklisted process makes network request
    - Drops startup file
    PID:3360
- - C:\Users\Admin\AppData\Local\Temp\bin (1).exe
    "C:\Users\Admin\AppData\Local\Temp\bin (1).exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of AdjustPrivilegeToken
    PID:2696
- C:\Windows\SysWOW64\rundll32.exe
  "C:\Windows\SysWOW64\rundll32.exe"
  2⤵
  - Blocklisted process makes network request
  - 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:1620
- - C:\Windows\SysWOW64\cmd.exe
    /c del "C:\Users\Admin\AppData\Local\Temp\bin (1).exe"
    3⤵
    PID:332
- - C:\Program Files\Mozilla Firefox\Firefox.exe
    "C:\Program Files\Mozilla Firefox\Firefox.exe"
    3⤵
    PID:4836
- C:\Program Files (x86)\Ai6et6t18\7n7ls8dktw.exe
  "C:\Program Files (x86)\Ai6et6t18\7n7ls8dktw.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2216

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

Replay Monitor

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Downloads

C:\Program Files (x86)\Ai6et6t18\7n7ls8dktw.exe

Filesize
177KB

MD5
847f96edff4362a11a17a55a0f777394

SHA1
213b8bd653acaf9749af503b936fde0d9effdff4

SHA256
b7f9d8c856f2a427668235d49710a8ac3caa7bcaf5e317a064205127df431061

SHA512
6aed480e2aca2414e47d44e87ddce59da4809de9629c5fbc9c3e3bd1665a173efec1f13a3275d95ffcc63394b854caf9d2cd7e80af2868a08d0f8885b5470227

Download Submit
C:\Program Files (x86)\Ai6et6t18\7n7ls8dktw.exe

Filesize
177KB

MD5
847f96edff4362a11a17a55a0f777394

SHA1
213b8bd653acaf9749af503b936fde0d9effdff4

SHA256
b7f9d8c856f2a427668235d49710a8ac3caa7bcaf5e317a064205127df431061

SHA512
6aed480e2aca2414e47d44e87ddce59da4809de9629c5fbc9c3e3bd1665a173efec1f13a3275d95ffcc63394b854caf9d2cd7e80af2868a08d0f8885b5470227

Download Submit
C:\Users\Admin\AppData\Local\Temp\bin (1).exe

Filesize
177KB

MD5
847f96edff4362a11a17a55a0f777394

SHA1
213b8bd653acaf9749af503b936fde0d9effdff4

SHA256
b7f9d8c856f2a427668235d49710a8ac3caa7bcaf5e317a064205127df431061

SHA512
6aed480e2aca2414e47d44e87ddce59da4809de9629c5fbc9c3e3bd1665a173efec1f13a3275d95ffcc63394b854caf9d2cd7e80af2868a08d0f8885b5470227

Download Submit
C:\Users\Admin\AppData\Local\Temp\bin (1).exe

Filesize
177KB

MD5
847f96edff4362a11a17a55a0f777394

SHA1
213b8bd653acaf9749af503b936fde0d9effdff4

SHA256
b7f9d8c856f2a427668235d49710a8ac3caa7bcaf5e317a064205127df431061

SHA512
6aed480e2aca2414e47d44e87ddce59da4809de9629c5fbc9c3e3bd1665a173efec1f13a3275d95ffcc63394b854caf9d2cd7e80af2868a08d0f8885b5470227

Download Submit
C:\Users\Admin\AppData\Roaming\UdTkVakXFj.js

Filesize
299KB

MD5
4bf088310263e59715d08d30a5cd0997

SHA1
098a60960d3c74d31d0c67e9eb0e68d0bd19e4b4

SHA256
5aea8986b2b2f456f9c8a167872ee333e62b719c26590011da3518fd0d282570

SHA512
c66090e07a76c52521de51837a7f483fc0158f8bb29959bdc83e4d53d81baf3bf3284aaad50d18d4d43cf15cd834c5d4a01013271f6550da9fdc69cc00d99672

Download Submit
memory/668-167-0x0000000002590000-0x00000000025A0000-memory.dmp

Filesize
64KB

Download
memory/668-184-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-196-0x0000000002590000-0x00000000025A0000-memory.dmp

Filesize
64KB

Download
memory/668-195-0x0000000002590000-0x00000000025A0000-memory.dmp

Filesize
64KB

Download
memory/668-194-0x0000000002590000-0x00000000025A0000-memory.dmp

Filesize
64KB

Download
memory/668-193-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-147-0x0000000007F20000-0x0000000008053000-memory.dmp

Filesize
1.2MB

Download
memory/668-148-0x0000000007F20000-0x0000000008053000-memory.dmp

Filesize
1.2MB

Download
memory/668-149-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-150-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-151-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-152-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-153-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-154-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-155-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-159-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-160-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-158-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-157-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-156-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-161-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-162-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-163-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-164-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-165-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-166-0x0000000002560000-0x0000000002570000-memory.dmp

Filesize
64KB

Download
memory/668-192-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-168-0x0000000002590000-0x00000000025A0000-memory.dmp

Filesize
64KB

Download
memory/668-191-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-182-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-169-0x0000000002590000-0x00000000025A0000-memory.dmp

Filesize
64KB

Download
memory/668-172-0x0000000002590000-0x00000000025A0000-memory.dmp

Filesize
64KB

Download
memory/668-190-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-189-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-139-0x0000000007AA0000-0x0000000007BE3000-memory.dmp

Filesize
1.3MB

Download
memory/668-188-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-177-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-178-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-179-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-180-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-170-0x0000000002590000-0x00000000025A0000-memory.dmp

Filesize
64KB

Download
memory/668-181-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-183-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-171-0x0000000002590000-0x00000000025A0000-memory.dmp

Filesize
64KB

Download
memory/668-185-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-186-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/668-187-0x00000000024C0000-0x00000000024D0000-memory.dmp

Filesize
64KB

Download
memory/1620-142-0x0000000000760000-0x000000000078D000-memory.dmp

Filesize
180KB

Download
memory/1620-146-0x0000000000EE0000-0x0000000000F70000-memory.dmp

Filesize
576KB

Download
memory/1620-145-0x0000000000760000-0x000000000078D000-memory.dmp

Filesize
180KB

Download
memory/1620-144-0x0000000002AE0000-0x0000000002E2A000-memory.dmp

Filesize
3.3MB

Download
memory/1620-141-0x0000000000230000-0x0000000000244000-memory.dmp

Filesize
80KB

Download
memory/2216-176-0x0000000001710000-0x0000000001A5A000-memory.dmp

Filesize
3.3MB

Download
memory/2696-137-0x0000000001540000-0x000000000188A000-memory.dmp

Filesize
3.3MB

Download
memory/2696-138-0x0000000001890000-0x00000000018A1000-memory.dmp

Filesize
68KB

Download